i have some questions bout the vampire castle.
1. What can you do to it, besides the courtyard?
2. What storage is safe?
3. Do you get any privileges?

I want to add to this if I can too. I have an extra blood chalice. What do I do with this?

1. nothing
2. every openable container as confirmed by Kinotsu in http://www.gamesas.com/topic/1390220-heres-the-truth-about-storage-in-castle-volkihar/
3. nope