The actual stay was mostly fine. The arrival was a big problem. I arrived on a Monday (Ruhetag - no-one on site). They have a good system of a key safe, and I had been sent the code and room number. But in the email it did not say where the key safe was. There was a link for "late arrivals" but I had not clicked it because I was going to arrive quite early. (Had I done so, I would have found out where the key-safe was, not by the side door but on the wall of the adjacent building.) OK; maybe I was a bit stupid, but the main issue was that I kept calling the contact phone number and no-one answered (just music), so I was completely stuck. In the end, I had decided to try to find another hotel, and fortunately met some men in the car-park who were able to help.
The hotel was surprisingly quiet and I was told on the first morning that I was the only person booked in for breakfast, which made me wonder when the dozen hardboiled eggs had been cooked (?). Apart from that, the buffet breakfast was ok, and in the evening I enjoyed very good pork medallions with mushroom sauce and Späzle. My room was spacious - a family room really - and the bed comfy.