As the above poster said, there is nothihg mysterious about them. The closest we had of vampires running around in society and homes were in Daggerfall and Oblivion, where they could walk around without being shunned and being known as a vampire. That being said, vampires in ES are better off in forts, ruins and caves where they ca do their little group therapy in broad daylight(Yes, I stole joker's joke).