We spent two nights at hotel pension Haydn and were very satisfied. Breakfast was excellent, the room was tidy and the Internet connection worked well. Location was also very good, a quiet street only about 1,3 km away from the main train station.
The other bed was a bit hard to sleep in. There was a little bit noise coming from a room next door and from the corridor so the room is not sound proof.
Still, we would definitely come back!