Spiegelkwartier B&B was a great stay for us over New Year. It was like our own little place in the city. Completely independent check in, collecting keys etc.
We didn't see the owners or host (a girl that stays in the same building) once. Breakfast was available to us and our rooms and bathroom clean each day.
Location was good, we rented bikes so was a lot quicker to get around - and fun!