"The key for us has been to maximize the small space we have as much as possible (i. the second floor landing is now a play kitchen area and a reading nook where before it was just an office)." In the reading nook, the mattresses are from Urban Outfit
You don't need no stinkin' sofa! Put some nice fluffy cushions directly on the floor. Take that futon cushion off the frame and fold it against a wall. Add pillows and blankets. The options are endless!