I can only see a couple of walls that have electrical outlets, and the one at the foot of the stairs will be too tight for a console or table and lamps. Once you have table/lamps determined, a large rug, rather than a door mat, will warm the space. Tape it out with painter's tape on the floor. You'll want surrounding furniture to sit off the rug. Other walls look to be optimal for beautiful art, and you may have space for a pretty upholstered chair.