My room started out at about 9'x12' but has a protruding closet which takes up room in one corner.......My hubby made floor to ceiling shelves on part of two of the walls.....and in one corner, I have a triangular desk for computer and TV......There isn't too much space left in the center so he built me a table which is 20x42" but has two drop-leaves, each 26".
I can have a 20"x42" table or with one leaf up, it becomes 42"x46".
When I really need a larger space, I bring up the other leaf and I have a massive 42"x72" work area....not much open space remains in the room, but when needed, it works for me.
MJ in NJ