Everyone has their own gross out factors, but I think hair left behind is a universal gross out. I'm kind of nutty about hygiene and I would certainly want something done. I just don't believe it should all be on you, though. If they are providing quarters for you, as part of a grant or subsidy or what ever, the place should at least be clean.
I hope the counselor can help you with this, because you shouldn't have to put up with an unsanitary living condition. It all boils down to the fact that someone in charge of getting the rooms ready for the new semester did not do their job well. Your job is to get high marks in class, not deal with last the occupant's filth, yourself.