I don't think any vampire, other than the Master, has survived that long in my world. Maybe Dracula? I forget how old he is. Is 528 considered old in your world, or are most vampires older than that? As far as I know, Darla and I were the first vampires to have a human child. Powers That Be owed us a life, and they delivered. Although it might've been nice if they'd given us a heads up first.
Uh, I think most of the humans in my world either have never seen a vampire or are deeply in denial about it if they have. We kind of keep a low profile (and not many are actually any good at killing people; most of the young ones die before they ever learn to hone their skills). We also have vampire slayers, which maybe explains why we don't live as long as your world's vamps.
Those sound like mostly pretty good qualities to have amplified. The single-mindedness, I can relate to that causing problems when you get too deep into it, but otherwise. You lucked out.