We booked a deluxe room and the allocated room met most of our expectation as we had stayed in a similar hotel in France (i.e. a renovated chalet) which also was very good. We had a room in the old but well renovated chalet, but there are other rooms in a new building that do not appear in the photos on the web sit, and so our comments do not apply to those rooms.
Our room had been furnished as a Japanese room, and while it was tastefully decorated, the Japanese bed is very low, and there were no seats in the room. as a cushion was provided for sitting on!.
There was a small table and a chair to allow for computer use and writing. Otherwise the room was very good, and so was the free Internet.
We are not sure about a Japanese style room in Germany!!
Given its location in the country side, and not far from a beach, you would need a car to get to it as it is not near any transport.
The breakfast was good, and it felt like being in a good quality hotel, so it is a good 4 star hotel as claimed. Happy to stay here again.