Cool hotel within walking distance of Alexanderpla...

Cool hotel within walking distance of Alexanderplatz. Rooms are either on the city side or in the inner lobby area. A huge aquarium is installed in the lobby area which unfortunately was just renovated during our stay.
With luck in the allocation of rooms (we had it by accident), there are also rooms with a view of the television tower.
Staff friendly and courteous.
At breakfast nothing was missing.
Price / performance for Berlin standards absolutely fine.