Very Expensive (and I have never tried it). There is also a luxury restaurant in it. The only time they will not say anything if you don't come without a tie or dress is at the Carnival. The picture shows the "Three kings" on the front during Carnival. It is always a special procedure when they are dressed up for that.
NOTE: As I just learned, the hotel is closed due to renovation work until the beginning of 2006!
Luxury with a view.
The location on the rim of the Rhine makes it very central for any excursions through the city (tram and bus and ferry have stops right in front of the doors). The view if you have a riverside room must be very nice.