Tiny living is not for everyone, and even more so if you are over 6' tall. most furniture is designed for those people that height is not an issue with. Beds are designed to fit in small locations or set up with the headboard against the front end of the room
Bunk beds have been specially designed to fold up out of the way when not needed
bathrooms have at the most a sink, shower and toilet with enough room to stand in the shower to use the sink.
there are some units that have fold down desks
You can also have special supports installed in the wall so you can hang the flat screen TV
So yeah, know a little about the design of these things. figure that if you can fit it inside of an 8 1/2' x 20' area and conceivably make it usable, it can be done.