Just want to warn you that I'm kind of OCD guys, so don't take my feedback too seriously, unless you have the same issues with sensitivity to the outer world.
The house is in very quite neighborhood, and there is very fresh air outside. However, if you are on a bike, keep in mind that the place is on a pretty steep hill.
The room seems to be comfortable but pretty tight at the same time. The ceiling is low. Since the room is in the basement, there is some smell of moisture, not very annoying, but noticeable. Bathroom is pretty cold in the morning, and the room itself too (until 6am, when automatic heating turns on).
Everything else seems to be ok, but not perfect. Didn't have a chance to meet hosts (I came late and leave very early), but it seems that they are good people and care a lot about their guests.