They operate with different buildings scattered across the neighborhood - we stayed at the Meyerheimstr. building.
We were expecting a quaint, basic room. What we got was a very filthy room that is indeed very quiet (since it is in the second courtyard away from the already very quiet street), but that hasn't been cleaned properly in ages.
If it would at least have been a bargain, one could argue that if you're not picky about grime and dirt everywhere, you could stay there - but if you're on a budget, there are much better options available (for instance, a proper Holiday Inn around the corner, for only a few bucks more). For what it offers, it is way overpriced!
Stay away, or you'll regret it. read more