That would be it, yeah. They're very powerful though, so watch your ass out there when you find them.
You're going to have to do a bit of digging since I can't pinpoint their exact location, but I would say they're around [location]. Just keep an eye out, check out some of the local bars and clubs for any signs of them trying to lure someone out for a feeding, and try and see if you can follow them back to their nest. If the nest is too big, I really suggest you call on back-up. Vampires may be going extinct, but they're still tough. Knowing that they're going extinct only makes them more desperate to stay alive.