Bars are notable for staying open late, but I’m not really familiar with alternatives that might operate similarly. I think many cafés (at least around my area) tend to close a few hours earlier by comparison, which would be my go-to for an alternative otherwise, so what other options are there?
Re: Vampire. It can be, but doesn’t need to. It’s set in the real world, so it’s as depressing or not as our world can be.