You should try Brilliant Breezehome and Burrows. It sounds like it has a lot of what you are looking for. The home is pretty cool by itself but the burrow caves are scary and you definately feel like you've been cave crawling when you come out. It has a basement area in the Breezehome part that has a sleepng area for a vampire and his followers, with a back entrance. it's not on the Nexus any longer but here is a link to it on the TES alliance. I've used it for some time now and love it for my followers. Not sure if the author is still around though.