A wearwolf will not go over too well no but also not terribly because in general this is a very weird world with very weird things so people's nonsense levels are higher than some world.

So as long as he isn't doing anything obviously magic/messing with the powers of the world it will be fine!

As for ghost rooms. My first thought it these are probably wild because of the shifting nature of the world. So there have been many places that once existed and will exist and could exist layered on top of each other.

So there could be ghost rooms inside of ghost rooms if you wanted to play it that way.

They will be a mix of all sorts because of the different places and times that crash together here.