The available comforter was very thin and small, even for one person. No problem during summer or for someone who doesn't mind sleeping with thermostat turned up, but I personally like sleeping in a cold room warmly wrapped. I have honestly never seen such a small comforter in a 4 star hotel before.
I tried to book a few spa services the night before and out of 4 I managed to get only 1. However when I arrived for it, the spa area was pretty much empty, which would suggest that the problem is not with guests filling available slots but with staff availability. Given, it was a weekend, having more staff would hopefully solve the problem.
The hotel is very nice and in beautiful area. Rooms are spacious and comfortable. Excellent food (even when served as a buffet) and staff very polite and helpful.
Direct access (at extra cost) to Therme Loipersdorf (it is possible to go there in a robe) in addition to onsite services (swimming pool, sauna, steam bath and spa services).
Very nice spa services (if you can get an appointment - see what I didn't like).