Idea for tiny house if you have stairs to loft. The depth of space under a staircase can be sufficient for a built-in entertainment center that houses a flat-screen TV and a bookcase to boot, along with drawers for remotes, movies, and game accessories.
Bedroom with loft. What a great use of space for a room with a vaulted ceiling. A walk in closet could be under that loft and you haven't lost any space. ** Could be a good office space, with the bed up in the loft.