You can contact the Alphentherme spa by the underground passage very easily. In addition, breakfast is good. That's all about the hotel,though.
Receptionist was not that nice. When I tried to change my room because of bad smell, he told me I had to go to him by myself to get new keys.
Moreover, Hotel is very old with not good condition.Even worse, in the night time during the stay, there was a sudden blackout twice a day. Much worse, the telephon in the room was out of service. So, when there was some trouble in my room, I had to go to the reception to announce that by myself. It's very uncomfotable. :(
I don't like this hotel except breakfast and spa.