My question involves landlord-tenant law in the State of: Pennsylvania

I rent a house with 6 people and 6 rooms, one of them (mine) being in the basement. I've been here a week, and I hate it. I've come to find out that it's illegal. There are no windows in the bedroom itself, and the one window in the basement is about 2'X1' with a grill fastened to the outside. The water heater is in a closet right next to the room. There's also a bathroom and laundry room down here. I sleep in a fire trap.

I want to break the lease because I think this is a fire safety hazard - but can the landlord claim that the room isn't meant to be a bedroom? They treat it as such verbally: they asked that if I put a lock on my bedroom door in the basement that I make a copy of the key for them. But, I have nothing in writing; the lease just states that the house is fit for 6 people. Do I still have grounds to break this lease and not be obligated to pay the next 9 months rent? It's an old house too - do grandfather laws protect them from not having appropriately sized exits down here?