Overall, it is a good deal, and I would recommend to stay here if you are on budget. However, you need to understand what you are paying for.
1. Hotel staff do not respond to questions through Expedia. Instead write to them through the BW website if you need.
2. Check-in time is 15:00. As I arrived early morning, I waited until around 12:00 before a room was available. It was not a problem as I had a nice morning walk around the city center which is about 10 min walk from the hotel
3. They have an underground parking garage for EUR10 a day which is a good deal (unlimited entries and exits). However, the entrance and parking spaces are tight (as in most places in Europe).
4. My room was small, but clean and nice. I've got a kitchenette (was offered at check-in). There were a stove, refrigerator, plates and cutlery, cups and glasses, a kettle, tea and sugar, all are complimentary.
5. There is a laundry room in the basement which you can use for a small fee; they also can sell detergent for you. An iron and ironing board are available on request free of charge.
6. The mattress and linen are of very good quality, and that is a big plus; pillows are not good.
7. The service is daily, including weekends, so put out the not to disturb sign if you need a quite morning.
8. Breakfast is extra for EUR15. There are numerous cafes within a walking distance, so you have plenty of a choice.
9. The bathroom was somewhat small, but it was clean and the water pressure was good.