I'm thinking something akin to this for the loft stairs, except with another loft on the other side and the second set of stairs meeting in the middle. "A 355 square feet tiny house on wheels in Felton, California. Designed by Molecule Tiny Homes.
Ok, so I know this is a bedroom but it's a great use of space for a small room. I particularly like the use of the dead space behind the ladder for shelving. It could also be a cool idea for a kids play room.