We stayed there for carnival and although fully booked they managed very well.
Rooms: extremely clean, beds are good, bathroom is modern. The rooms are nice, I guess renovated about 8 years ago but still in good shape. However first time I have seen for a while a hotelroom not equiped with a plasma screen, but thats just a detail :-)
Breakfast: Outstanding breakfast with huge choice, fresh orange juice, eggs,...Especially the choice of bread is impressive.
Fitness/Pool: You can use the fitness center next door, connected by elevator. Price is 15,20 per 24h! Well, pretty expensive but you get value for money.
Conclusion: It is called a 5* property but I would rate it 4*+ compared to Hotel Ernst or Domhotel. You will have an excellent stay, located in the city center and if you are lucky you find it even around 100€ for 2 breakfast included.
Good to know:
Rooms: request a courtyard room, noise of the street can be heavy
Parking: use the Kaufhof Parking P2, much cheaper than the hotel and only 200m away. 15€ per night.
Fitness: If you decide to go a second time to the gym within 24h you do not have to pay again the 15€ according to reception.More