Nice hotel. Overall very pleased with the room, service and facilities, but some negative remarks.
Hotel had an event on one of the evenings/nights. Very loud music and disco lights into the room. Check with the hotel prior booking, if loud music is a problem for you.
Also, you have to walk to another building for breakfast. OK when weather is nice, but not what you want during the winter.
Not what you expect for the price you pay. Location is good, but you can get same or better hotels in the area for a lower price.
Conclusion: If price is not a subject, and you do not mind a 3 minutes walk for breakfast, it is a good choice. Being a frequent Berlin traveler, I will go for another hotel the next time.