Turn basic IKEA cabinets and dressers into multi-functional platform beds: you get both beds and storage in the same footprint.
Bed couch with draws, shared room, space saver. this could go in bedroom area. like the shelves idea, too. can add a light wooden dining table and a few comfy folding chairs to make cool dining area in bedrm space, if bed moves to living room area.
small office space - don't love the wiring on the sides but I like the simplicity and size