The bedroom may be small as well; provide it with a twin or full size foundation, a nightstand and dresser. Keep chaos in this room to a minimum as well, and add color with large wall membrane hangings.
Any room looks larger when it's filled with natural light. Most rentals come furnished with mini blinds, but if you need to make the room look bigger there's a simple trick that truly makes windows look larger. Suspend a curtain rod that is around twice the width of the screen; use light or colorful sheers that are drawn back to both sides. You might hang the pole near the ceiling to provide the impression of the tall windows as well.