I used to build apartments, primarily low income, but also student housing. We didn't have anything to do with the tenants except warranty work (which was really limited), and normally was phased, so first few buildings would have renters, while we finished up the last half of the buildings.
So, honestly, the low income weren't That bad, although normally a bit trashy, messy, but not destructive.
I have a few friends that have rental homes; one guy had about 12 homes, but I think 4 are rented to his employees (he's primarily a construction outfit). He had to have a 'talk' with the general tenants during covid, that if he didn't get his money, they would face problems, no matter what the law said. Another has one like quad plex and then a cabin. The cabin has been rented by the same couple for like 13 years. The wife has SS disability, and husband has a rather erratic work history, but he keeps rent cheaper than he could, because it's stable.
Had an old co-worker that had 3 or 4 real Dumps; really nasty stuff up in Jacksonville, and frankly, he said those were the best. The tenants were all cash, and all involved in illegal stuff, drug's/gang stuff, and they would pay, and he looked the other way on what they did.
Edit: the guy who owns the quad plex, has had some issues with the city; wanting him to retrofit handicap parking, dumpster enclosure, ect, and last I talked to him about it, he was considering getting rid of it.