Room was wonderful, loved the view of the Prater amusement park (really unique, magical view, especially at night). The rooms are designed incredibly cleverly - and a lot of thought has gone into how the room is used. And the room was done up to a high standard with good quality materials and hardware.
Service was great, although buying extras for the room - like wine, toothbrushes, shaving stuff - is all charged at a substantial premium.
Overal a very pleasant stay - I'd recommend the hotel strongly to anyone visiting Vienna.