I have followed the guide to un-haunt the house at anvil, however when I go to the elven gardens in the imperial city to speak with Velwyn, he just denies helping me. The guide says I should be talk nice to him, but my disposition is at 100 with him and is not giving me any other choice but to blame him for selling me the house. What can I do?

I have the same problem.

go back to your house soon as you walk in to your left is a cabinet that use to have a jar on the top. After you have gotten the ghosts to spawn the jar falls off and there is 2 key items a note and a hand take both go to velwyn talk to him again

I had the ghosts attack me as I went to sleep in the place.

Hmm..ghosts have spawned, but the jar hasn't fallen off the cupboard. Is anyone else having this problem?

it should have worked try reloading before you sleep then sleep 1 hour and kill all the ghosts that appear in your room then go downstairs and it should have fallen then.