Excellent facilities: I used the swimming pool most mornings. Great view over the town, fields and forest, with several footpaths accessible direct from the grounds. Comfortable rooms with good facilities except that mine had no blinds so the light woke me up every morning.
25 of us, all members of the Vegetarischer Bund Deutschland, were there on a week's walking holiday. The breakfasts were good and those who ate dairy & eggs were well catered for in the evenings too but the the vegans among us were let down by main courses that largely consisted of potatoes and little else. The soup was rather watery and the salads the same every day but the desserts were amazing - real works of art and delicious too. Unfortunately suggestions provided well in advance were ignored by the chef, as were my comments that vegans could eat much of what was provided for the vegetarians, e.g. aubergines, when it would have been quite simple to omit the cheese from the stuffing or use something else such as tofu. We vegans didn't exactly starve but had no choice and got far less for our money than the non-vegan vegetarians.
Astonishingly, apart from the first evening we were expected to pay for (room-temperature) tap-water with our evening meal.
Unfortunately the rating system on this site has nothing between 'average' and 'very good'. I'd award simply 'good' for some aspects, but one expects everything in a 4-star hotel to be at least 'very good'.
However I disagree with much of what Fredontheroad writes, e.g. the towels were plentiful and not thin, the pillows were enormous, my shower was fine and the bar stayed open until after 11 pm. The free Internet access was actually quite fast and the equipment not at all ancient. Anyway who wants to spend much time checking e-mails while on holiday!