I stayed at the Luhmann's Hotel 3 nights. It is very well located, just 200 mt from a subway station in front of the new City Hall (a beautiful building), and very close to the old city center.
The room was very confortable and with enough space, with a big window, very quite to have a good rest. The hotel provides a free of charge pair of water bottles and free wifi room connection, but the quality of it was not the best (some slow and unstable).
The breakfast is really excellent, with high quality food and beverages, including fresh squeeze orange juice (selfmade) which is rare in Europe.
Good restaurant if you prefer to stay at the hotel for dinner, some typical german food, with affordable prices and good quality.
