How hard do you think it would be to break my lease?

So I live in Nevada and i signed a 6 month lease on this condo in november (its an apartment but since different people own every unit they decided to be fancy and call them condos). We freeze our s off because we don't want to turn on the heater. When we looked at the apartment he said there was the electric ones on the wall as well as a gas one and we need not use the electric. After moving in and realizing there was only the electric (I should of checked I know) we used them and got a $300 power bill for one month. Ok this is the one thing I hate about this apartment but let me tell you the reasons I want out of the lease NOW!! My roommates car was broken into by the neighbors two weeks ago and she has filed a police report because they stole everything. The guy downstairs has quite a few cats and the smell is horrible. People don't want to come to my house because of the smell. It smells by the front door and the balcony and our landlord has tried to take care of this but obviously nothing is being done so whatever. The dishwasher has yet to work since we moved in.. he let the maintenance guys come put in a new one and that one did not work as well. They keep promising to come back and fix it but they haven't. I also keep finding earwigs and ants in my apartment and I cannot stand those. With all of this and if I give my landlord 30 days notice do you think I can get away with breaking the lease? I don't want to have trouble finding another place to live because of this.