We opted against the breakfast, simply because the price didn't compare to the excellent cafe just yards away from the entrance, but that was our only quibble. Internet a bit slow in the room we were in, but acceptable.
The location is a dream, the rooms and bathrooms generously sized, clean and light, massive wardrobe space, good hangers, fantastic shower, firm mattress but on a sprung slat base, so even good for curvy pear shapes. Even had a balcony, and overlooking the quieter road. A gorgeously designed hotel, two lifts, staff wonderful. As we have family in Berlin we'll certainly choose this hotel again, so close to the U-Bahn station, and a little supermarket, bakeries, cafe, pharmacy and an excellent Mexican restaurant all within a stone throw. Perfection.