Location: 5 stars, super right on the cathedral an...

Location: 5 stars, super right on the cathedral and the Spree and central to the Museum Island.
Staff 5 stars: very polite, well trained and courteous. Booked
BUSINESS double room: 3 stars, small, no shower, tub with shower. Beds too short. Location to the cathedral also costs 50 / day extra.
Breakfast buffet: 3-4 stars, on the 2nd day no salmon / fish, cold cuts poor and not laid. Plus fresh fruit and smoothies.
The room category and breakfast buffet don't justify the price, only the location, staff and lobby with the impressive aquarium.