It's hard to say without any information about who lives in the house, your interests, and your design style.

In general, I would put a comfortable chair under that light by the fireplace with a table nearby to hold a snack or a laptop. Put another coordinating chair (low back) on the opposite side of the fireplace with a little rug. So that is your reading/conversation zone. On the opposite side of the room, put the sofa under the windows. Put the piano against the one big wall, and fill in the entire wall with open shelves that could incorporate your TV if you plan to include one.

A coffee table ottoman in front of the sofa. 2 chairs with a console table can float in the middle, towards the sofa side of the room. Add lamps, art, pillows.

I would do a sectional with a view of the fireplace and window and then a separate seating area behind it with a table and chairs (for board games, laptop, etc).

My place gave a similar challenge with the living room. I settled on using a couch to split the room into a TV/sitting area and a work/informal dining area. The couch is on order so I can't say how well it worked... but it looks like you could do something similar: table or desks near the blank walls (we went with an L shaped desk and a small round table) then whatever seating arrangement works for your TV or socializing needs.

I tend to break long spaces into two, using the old (floated) sofa-and-console or chairs-and-bench-or-whatnot trick...but I don't think you have the room for that division to be anchored to the fireplace. How about making your main area on the opposite side, with a modern, very plain sectional (along the lines of DWR Neo) against the blank wall and around the corner, put a sideboard or chest under the window (something old, with patina), float a couple non-bulky chairs in front of the window -- maybe even swivel chairs-- (low table between), simple coffee table in front of the sofa, even a shallow console behind the sofa against the blank wall behind the sofa if you can fit it so it can hold a lamp and "decor", then but an extra wide bench in front of the fireplace...museum bench, Indonesian daybed, whatever...according to taste. It would make the whole room usable while keeping the center open.

Congratulations. If there isn't a formal dining room elsewhere in the house, I'd guess the three window area was intended for formal dining.

Otherwise, piano goes to the right as you enter down the steps (or consider it doesn't HAVE to be in the LR area). Use the FP as one main focal point area and the 3 window area could be a more intimate two person visiting/glass of wine area or reading area. Do the main block of windows face west? If so, you'll need to invest in curtains or drapes or something and even with the view, not make it the main focal area; save that (again) for the FP.

That's funny...I forgot to figure in your piano. Truth is, I don't see it in there. I don't see it as a TV room, either, because you have so many windows. But I can imagine a small dining/game table in front of the fireplace. And do exit the pendant light.

What if you did an S-shaped sectional? You could have one of the S facing the fireplace and the other facing the small window/wall on the other side of the room, where you could mount the TV (on the interior wall on the right in pic 2). Get something with a low back and it wouldn't obstruct the view of the window.

West Elm has the Baxter collection which would work well. Basically it would just be two couches, one with a right-hand chaise, the other with a left-hand chaise. Connect the two in the middle and you have one big awesome couch! If course that would cost like $3k.

http://www.westelm.com/products/baxter-sectional-g031/

I had a similar set up at one point. I put a sofa facing the fireplace wall with a chair in the corner and cushions for the fireplace ledge for extra seating. I had a small bench along the window to hold plants. I put a dining area where your window wall is, but that would be a great place for your piano and you could place a smaller table, that could also be used for dining or a desk, there as well.

I'm leaning toward 2 couches facing each other, coffee table between. One couch has it's back to the window and the other is floating in the room. Put an area rug and coffee table between them, and make sure they have low backs so as not to obstruct the views. Put the piano against the wall at the far end of the room away from the fireplace (to the right of the far window). Change the light fixture, do some lamps on side tables. I also think the walls could use more color, since you have very little room for art, but it will depend on the other colors you bring in. Good luck!

I'm on the same band-wagon as those saying to split the spaces into two. You already have he piano so now all you need is an item to separate the space. Sofa, see through shelving or screen, plants...etc.

I'm also on the bandwagon. I used to have a long living room like this, windows all on one side. I put my couch about halfway down, facing the wall (fireplace in your case), and put a hefty sofa table behind it. That divided the room into two snug nook-like spaces, allowed lots of room for traffic and mingling, and really made the place "sing." Plus, it was kind of like having two rooms instead of one - a nice bonus!

Do some research on interior design from the time period of the house. I'm just dying to put a long low Mad Men sofa in this room either in front of the window or facing it. Depends on the dimensions of both room and sofa.

Guessing on dimensions from the picture, I'd do this. Get rid of the hanging light...really. If your piano is going in this room, you must put it on the interior wall without windows - best for the piano to not be on a cold, exterior wall. (Read up on that online.) Best anyway, in your room, it turns out. Place a sofa in your chosen style across from the fireplace, facing it. about 2/3 of the room length away from the fireplace. I'm assuming this isn't a living/dining room, that you have a dining room elsewhere, or you might have said so, so under the window opposite the fireplace, put a piece of your choice, depending on your needs and desires: console table, bookcase/cubby unit, table for games, etc - nothing that comes up as high as the lower edge of the window, though. I'm thinking console, unless you need bookcases or storage furniture of some sort (a buffet would work nicely), or else a desk there under that window if you want a desk in this room. Delineate the two areas of the room with rugs - definitely one anchoring the seating area in front of the couch, perhaps a second in the area behind the couch. Put a comfy chair (I like a small rocker, you may want something else) across from the couch toward the corner, and you have your seated conversation area. Coffee table in between the couch and chair if you like - but not too big, you don't want to impede access to the windows. This room doesn't look all that wide, so don't pick a huge long couch that won't allow you walk by it easily on the wall side...you may need to shop for apartment sized shorter sofas. And leave room on the other end of the couch, the end by the window, for a small end table with a lamp on it, as you don't want the sofa right next to the window. Depending on the size of the room, you may need to move the sofa closer to the fireplace, foregoing a coffee table, in order to have room to walk by it and still get around the end of the couch comfortably without being too close to the piano, which will be closer to the back window wall. If the room is longer than it looks, you may have room for a narrow sofa table, perhaps in the form of a low bookcase, behind the couch. If the pictures make the room look bigger than it is, and it is not long or wide enough to do this layout, then consider putting the piano in another room, and doing everything else as above, with a smaller piece of furniture where I've noted the piano should go. If the piano needs to go in here, then put it on that long wall, and see if there is room to float the couch facing out the big windows, with room to walk to the far end of the room behind it ... I can't tell if the room is wide enough for this or not. By no means should you put the couch along that long wall...that will suck the life out of the room. If the room is not large enough for a couch and a piano in these two layouts, and you want the piano in here, forego the couch and use a few chairs - takes up less room. I would not place the couch in front of the windows in this room - you want the couch facing either the fireplace from somewhere in the center of the room (not from under that window in the back wall), or floating in the room facing out the window. You want a nice view from the couch, not facing toward the steps down into the room. Putting a sofa under that high window opposite the fireplace will also suck the life out of the room, and separate it too much from the fireplace to make best use of the fireplace. You need to place the sofa taking into account both the fireplace and that long wall of windows. Good luck... nice room!

anyway, it's a beautiful room!

I have a long living room of similar dimensions, but doors at either end and the window view is straight into a hedge. I've put lounges in front of the windows and entertainment unit on the opposite wall.

Definitely the most comfortable way to use a long room is to turn it into a wide room, but you would need to be careful of your placement and choice in furniture so as not to ruin your view.

I have the same issue. I would recommend breaking up the space. It's too long to arrange the furniture into a conversational area, otherwise people would be shouting across the room at one another. So, plan a converstaional area, with couch, sectional, chairs, whatever, maybe near the fireplace, then plan another "region" of the room as another space or use, like maybe another chair/table layout, desk area, bar area, whatever.

At least you don't have it as bad as Celebration, FL. They put out pumpkins and shoot paper confetti "leaves" into the sky: http://lh3.ggpht.com/-mkmljZ1kkLo/TpNyYXEeUrI/AAAAAAAAPRI/Lh8fw2w8CNg/s1600-h/finding%252520out%252520we%252520were%252520pregnant%252520%2525281%252520of%2525201%252529-2%25255B3%25255D.jpg

Great space! My suggestion would be to place your sofa facing the large window and another smaller love seat facing the fire place. That window is too beautiful to block with a sofa. You can put a small table behind the sofa with some decorative pieces so that it's pleasing to the eye when you walk into the room. Some flowers or plants would work since it will complement greenery in the view from window, family photos would also be a sweet touch.
If you don't want a love seat, you can use two chairs with a small table in between to make a small conversation area. I'd place the piano below the smaller window on the opposite side of the fireplace. Hope this helps and Good Luck! Would love to see after photos.

good suggestions above, esp the zones ideas. houses from this era are not designed w/ furniture in mind & vintage books show arrangements that make little sense, so get some basic pieces & try a few ways & there is no good answer. one q: in what design universe is that room 'cape cod?"

Well-- looks from you pic you have a nice little garden to view through those beautiful windows-- I have a 23 by 16 living room in an old farmhouse with original windows one very large with stained glass so I certainly can relate to your post! I suggest having a small love seat size couch (not anything "poofy" or large) because they seem to 'suck' up the most room placed across from/facing the window. ie think of watching the fire and snow fall at the same time! Plus if you like you can place several bird feeders and water fountain/bird bath outside that window and one of those great microphones to hear them in them sing all year long! !! Then I'd place the piano in your "wall of honor" the solid wall across from the fireplace with special photos/mementos on it. The fill in the gaps with small cozy chairs, footstools, side tables and living plants..