The area of a 2 by 2 square stateroom, especially if it was made more rectangular to increase length of usable wall, is actually quite a lot.
Add in the ability of smart materials to assemble, disassemble themselves as required for furniture; AR & VR overlays and sensory feeds; holographic projectors and wireless linkages... the "actual" stateroom might seem to be a completely bare space, bar the luggage that the passenger brings with them.
Although to the occupant it would seem opulently palatial.