We booked here for a wedding anniversary weekend, off season. Although the hotel looks impressive from the outside, the 'First Class' rooms were not first class, by any standards. Old style furniture and chipped and cracked bathroom floor with very old bathrooms. We asked to change room and the reception assured us that all the first class rooms were the same.
The breakfast buffet is excellent - everything you could want was there.
Be aware of the package with the spa - usually in a spa costing this price there is at least a sauna and steam room..... Not at the Alpentherme. You have to pay extra for the sauna and steam room access (almost double the price), which we felt was extremely excessive. However the pool is beautiful. We used the sauna and steam facilities at the hotel.More