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Use a flexible "hospital curtains" track attached at the two ends. This has been covered many times at AT. Search the archives.

I have the same condition at my window - except mine has 2 windows on the right wall and 1 window on the left.

I have solar roller shades that mount on the underside of the window frame or "ceiling". There will always be some overlap at the corner. You just have to measure carefully. But this way the amount of light coming in is maximized when the shade is all the way up.

The problem with curtains is if you want the treatment inset into the window opening, there will always be some amount of curtain still covering the glass, and the curtains can't be long because of the radiator and wall-thru a/c under the windows.

Custom Roman Shades.

Personally, I'd probably leave them untreated (to maximize light) and focus on putting plants and whatnot in front of the lower window, to block a little bit of the view from the outside looking in.

Maybe you could mount something from the ceiling.

I agree with Fingernail, I think custom solar shades are your best bet. Of course, you'll have to make them inside mount since you don't have a place on the outside of the window to affix them. It is also difficult to tell, but it appears as if your window frames are aluminum. If you need to mount a window treatment bracket into aluminum, you'll need a drill and self-tapping screws... it is a piece of cake with the right tools.

Good luck!

BlindFINDER.com
"All you could ever want to know about window treatments"

I like the Roman shades idea, too, but if you want curtains...

Ikea's Kvartal system has ceiling mounts and even a curved track for the corner. The only drawback might be that it has minumum dimensions to fit the track system
OR, try West Elm's steel cable system mounted at the sides of the windows and feed the cable through 2 round screw hooks installed at the corner.

Practically, I think shades might be the best option since that looks like a radiator under the right window.

I'd be wary of Roman shades because when fully open, there is still at least 6" of it hanging over the top of the glass. I had Romans on my windows for a few years, and before that I had long curtains for a few years, and before that I had short curtains. There was something wrong with all of these types before I decided to go custom with roller shades.

I ended up using The Shade Store because they have a showroom in Soho and I was paranoid enough to need to see the actual brackets in person to make sure they would work with what I have.

Instead of mounting anything (that made me laugh) have you thought about a window film instead? From the photo it doesn't seem that privacy is a HUGE concern and it would be a shame to hide that molding...maybe you could do a cool DIY pattern to filter the light but not hide such pretty windows.

Given where the window is placed, do you really need to cover it for privacy? Maybe just put a potted palm or small tree in front, and skip the curtains.

I have used that window film (I got it at Lowe's) and it actually just gave a frosted look to the windows. I also left like a 1/2 border of clear glass. So the light comes in but you got your privacy as well.

I always like the idea of roman shades, but even open they'd reduce the light here a bit. And I really think you want to avoid reducing the light.

Is privacy an issue? If not I'd want to put curtains on either side of the windows - they'd be more decorative than functional, so you could snug the rods right up close to the ceiling. It would give the impression that the windows extend further out to the sides than they actually do. Ideally, I'd run the curtains right down to touch the floor - unfortunately, there's that damn radiator - if the curtains stopped just below the bottom of the window would that look too motel-y?

If privacy is an issue does your budget extend to those roller blinds that let the light in but give some privacy when needed? They'd be the most unobtrusive window treatment whether up or down.

Would love to see what you decide.

When I lived in the States and owned my own home, I didn't want to put nails/screws into the wooden window frames or on top of the wallpaper. I bought tension curtain rods which fit right into the window frame. You can move the rods up or down to any height you wish. The curtains looked very pretty actually set into the window frame.

I agree with the frosted window film (an Ikea staple). Or, I once used a product (don't remember the name) that allowed you to create a stained glass look. It consisted of black rubber like paint that you created "lead lines" with. Then you filled in your design with the colors of your choice (I would just use the clear to give you an art glass effect). When it dries you have stained glass effect with texture. When it is time to move (or if you just get bored with it) it peels off in one sheet. This stuff is really kewl!

Deocrative Window Film That'll solve your problem! It's cheap and easy to install.