Very nice hotel in great location, close to both Marburg railway station and the old town, with small (but adequate for the price) but clean room and a great breakfast buffet, BUT.... AC was broken in one of the hottest weeks of the year. Our room was sunny and overlooking a busy crossroads, so it was unbearably hot, but when we tried to open the window at night, it was simply too noisy to sleep. Little fan that was put into the room brought some relief for the heat, but was very uncomfortably draughty. In the end, we hardly slept at all and were glad that we only stayed the one night in a room that, in my opinion, should not have been rented out.
Hotel staff was very friendly and apologetic but waited for us to complain rather than warn about the room at check-in. Apparently, there was no other room available, even though the hotel seemed far from full. A real shame, as it put a dampener on an otherwise great trip to beautiful Marburg.