First, the grounds are badly infested with fleas. I don't even own a pet, and yet I'm constantly finding fleas in my apartment, despite spraying and vacuuming regularly. Second, the plumbing in my building is clogged to the point of being highly unsanitary. About once a week, food sludge and/or sewage from my NEIGHBORS' drains comes bubbling up out of MY kitchen sink drain when I'm not even using it, which is disgusting and makes the whole apartment smell horrible.
Other than those two issues, I've been reasonably satisfied with my apartment, though I guess that's a bit like the old joke: "Other than that, Mrs. Lincoln, how was the play?"