The ONLY thing withholding rent will do is get you evicted, so don't do that. The condition is not a hazard to you, personally, because you know it's there and can avoid it and it doesn't affect the use of your unit.
Yeah, it offends your sensibilities but that, in law, is not relevant.
Do put your complaint in writing and keep a record of it along with photos so if somebody does have an accident at least you can prove notice for them.
Understand that "delay is the deadliest form of denial."
I suggest you also file a complaint with city or county code enforcement.

