Regarding Godfrey, I can very well imagine him sticking some spirits to act as spies, but I can't think of what else he would do.
As for a vampire assassin, well....
Some of the old medieval bridges were extremely heavily built. They were quite literally streets. I believe London Bridge was one of those, and there's a bridge in Italy famous for goldsmiths that's also effectively a street. (the name escapes me).
But the thing is that some bridges were large, heavy stone structures. So....
Let's say one of the pylons (or whatever you call them) was partially hollowed out. Drag a coffin in there and make one small hole big enough for a bat to fly in beneath the bridge, and perhaps something even smaller for the vampire to move via mist form.
It'd be a perfect hideaway. If you are careful to brick up most of the holes after you get the coffin and other things in, it'd be very safe, and if you need to escape in bat form, just fly under the bridge. A small dark bat under heavy shadows in the night is going to have an easy time ducking into the hole (particularly if the bridge has lots of architectural frills). The vampire is right below a major thouroughfare, very difficult to get to (since no access for people and opening it up would require taking the bridge apart), and has a surprise factor (bridge. Not catacombs or castles, but bridge).
Even if it won't do as a permanent home, it'd make a very good last-resort hideaway (like Strahd's cave in the mountains).
Ravenloft GM: Eye of Anubis, Shattered City, and Prof. Lupescu's Traveling Ghost Show Lead Writer & Editor: VRS Files: Doppelgangers; Contributor: QtR #20, #21, #22, #23, #24 Freelance Writer for Paizo Publishing
I noticed in skimming through the Zherisia Gazetteer yesterday that they added a lovely little London Bridge urban "myth," where superstitious people (and practical criminals) dispose of bodies over the bridge in the hope that their "sacrifices" will prevent the bridge from falling down.
[i]"I too have begun to wonder about the legendary wisdom of our guardian angel and his pet rock."
~ Evee Beiderbecke[/i]