Rotting turkey legs and maggots: lovely.
I've stayed in pretty sketchy places, but I don't think any of them stank or had a maggot problem. Cockroaches, yes; mice, voles, rats and other random vermin, sure. Maggots only happened once (because, as my messy roommates found out, you can't put dishes with milk and/or meat products on them in the sink and leave them there for a month).
I did, however, have a caravan of gypsies living in the parking lot behind my apartment. And I mean actual, literal gypsies: Travellers, living in trailers, straight out of Snatch
or a novel. They had family living in one of the apartments down the street, so they were invited to stay (and I was terrified
of the neighbours who invited them: loud, scary, intimidating people with a pair of unneutered, aggressive-as-heck rottweilers). They'd have loud parties alllll the time, there were smashed beer bottles all over the place, and their trash littered the parking lot -- which we couldn't use, because their trailers took up all our parking spaces. It was delightful. I called the police -- anonymously, because I was afraid of what would happen to me and my roommates if the neighbours knew I called -- almost every night to complain about the noise (I practically had the police on speed-dial), and did my best to spend my summer at friends' houses so I wouldn't have to deal with the mess and chaos.
I also lived in another house where my roommates were paramedics and search-and-rescue workers (they were amongst the Canadians sent to help out in the search for 9/11 victims); the guys were also army reserve and gun enthusiasts, and they left loaded
weapons all over the house. I tripped on one coming out of the kitchen. We also lived next door to drug dealers (the police raided their house while I was home; I got evacuated to a nearby business just to be safe) and there were violent fights in the street all the time.
I am now extremely grateful that the worst I have to live with is a crazy old lady who lives downstairs. I can't stand her and she hates our cats, but fortunately the landlady is on our
side and agrees the old woman is nuts, so all we have to do is ignore her wacky antics and highly inappropriate comments.
I am very much looking forward to eventually owning my own house.