Jake's apartment is a literal one-room apartment where Jake Sully lived in 2148 before he moved to Pandora.
Description[]
The apartment is described in Project 880: "Every night he goes home to a tiny cubicle of an apartment in a vast government housing project. The room is reminiscent of a cell at a federal prison, which is pretty much what it is. The amenities look like they are from a 747, which is to say they are efficient, space-conscious, and about a hundred years old. There is a single fluorescent fixture, which casts a sterile light over the grimy walls. It flickers constantly. One entire wall (all seven feet of it) is a TV screen."