"If it says Kempinski, it should also be Kempinski...

"If it says Kempinski, it should also be Kempinski." Unfortunately it wasn't the case with us. The service of a 5-star luxury hotel is different. We used the concierge service to have breakfast delivered to the room the next day. This is "Unfortunately, it went down somewhere, we are sincerely sorry." After a bit of waiting our Atlantic breakfast for usually 36 / person came into our room by a nice lady. As an excuse we only had to pay for one breakfast and were served 2. For guests who are not so "lucky", breakfast is too expensive in terms of value for money. (The orange juice, for example, didn't taste good.)
The spa offer is a bit puny with a small pool and small sauna.
We were not granted a view of the Outer Alster, but a view of a dirty inner courtyard. But it was quiet.

Conclusion:
It was worth an experience.
Location is good.
You pay a lot extra for luxury in the hotel.