First of all, the staff were not welcoming or friendly. The hotel is the first I've seen that operates a code system for the rooms. The first room we tried to check-in to, the code did not work. We went to reception and they gave us another code, which also did not work. No matter, they switched us to another room. This time the code did work, but there was an unpleasant smell coming from the drains. You needed to keep the bathroom door shut or the whole room would smell bad. The room was small but adequate, comfortable bed.
I also paid for use of the underground parking. This is another code. It worked the first time, no problem. However, after we used the car the next day to visit Hamburg. We returned late in the evening with the car and the code to enter the car park no longer worked. The reception was closed and there is no number to call. There does not seem to be any way of contacting the hotel management when the reception is closed, which is concerning if your room code suddenly stops working. We could not access the car park and had to park some distance away on the street and walk back to the hotel in the pouring rain.
The next morning, I went to the front desk to complain about the parking code the night before, I was told to email the hotel to ask for a refund of the parking charge. I did this immediately and more than a week later, have not received any reply or refund.
Very disappointing and I would hesitate to stay at another B&B hotel.