Well, I haven't been able to find a map or anything, but I do have some tips that will help you. First, you have to follow the child as closely as you can, he knows the way. You will have to go through a few doors. It's best to go into the maze with holy water. When the vampire with the chainsaw approaches you, if he gets close, he'll slow to a walk, but only if you're walking too, so if he comes up behind you, slow down a little, and he will too. Keep walking, and throw the holy water in front of you. A walk through the holy water one or two times should be enough to kill the vampire, but remember, he does get back up after a few seconds, so hurry away as fast as you can. On the plus side though, and this is only if you're brave enough, every time you kill the vampire, a roast beef appears at his head.