IMO: Anything that's not a converted unit or a 5-over-1, and where the construction company purchased insulation from somewhere that isn't a dollar store
Better than listening to your upstairs neighbor beating his wife. I would call the cops, but they couldn't do anything unless she pressed charges, and she never would. We would get quiet for a couple of days though, but then he'd be doing it again.
the only time i hear any neighbours are when they're either outside, or the upstairs neighbours drop a fucking anvil on the floor, then i hear a slight "thunk".
I know this is a joke but I wanna hijack this comment to say you could spread out the housing a little to not be apartments but still only take like 30%