If you only use a desk every once in a while, why not make the most of it by taking a dining table or a countertop and turning it into a now-and-then workspace? Click below for 5 pieces from the living room, kitchen, and dining room that can double as a desk... Above: The classic double-duty solution is to use the dining table as a desk. Image: Blu Dot Strut Table, $1,099 - $1,299 at Design Public.
For a smaller, narrower space a console table works well. Image: Turned Leg Console Table Table, $399 at Brocade Home.
A wall-mounted desk can be made from a floating shelf or a flip table. This is a much fancier version of the floating shelf idea: the Lax Wall-Mounted Desk, $675 at Uncrate.
For a portable laptop desk, a tall end table or TV tray works. The Offi Mag Table is shown, $148 at Design Within Reach. For more options, see this post.
We like the idea of a kitchen counter extended into a desk (image from This Old House). For a readymade version you could use a freestanding countertop or a kitchen island.