[Faust stays to the side and tidies up his sleeping space a bit. He can't be that annoyed at Rin since it's not like he can claim this is his room, but he can be annoyed at this place not having proper rooms to begin with. And for weakening his magic so he can't just fix up one of the houses...]

It sounds like you know more about it than I do.

[Which is to say, he's not going to be much help, sorry. But he'll come over to take a look at what he's doing.]

My world doesn't have things like this, at least not that I've seen.