Outside:
Lives in a bad muggle neighborhood. The street is often dirty, and nearby apartments get broken into and robbed often. Having magical protections on his apartment, he has only once been robbed. (Said incident prompted him to get the security charms.)
Living Room:
He tries to keep the living room most presentable, and it is furnished mostly with his Grandmother's old furniture he got after she died. Though the old television he had was stolen from him.
Kitchen:
He hardly uses the kitchen as more then a place to magically heat up his food or as a storage place. He had it set up for a while as a place to brew his potions, but moved it to his office in the Hospital wing. The cupboards mainly held potions which are also now at the Hospital wing in Hogwarts. The part of the wall that's cracked/crumbling is from an explosion of an experimental potion that he didn't bother to fix up.
Bedroom:
More furniture he got from his grandmother, though the mattress is newer and charmed to be more comfortable. As he was often very busy during his training, he didn't sleep at home some nights.