Okay! So, there's a few different kinds of vampires in the City, since it seems every world with vampires is different. But I can tell you about the vampires from my world, since the more basic rules apply to them.

Sunlight is ultimately deadly, food doesn't taste good, they need to be invited in places...they don't NEED to hunt for blood if they have access to a blood bank or somebody with bagged blood...uh...

Well, Conrad was also incredibly pissy about being a vampire, but hey, he'd be dead otherwise.