Stayed 3 nights, was a nice hotel. The room was clean, provided "freebies" nail file, shaving kit, shoe horn, sewing kit, toothbrush and toothpaste, "ladies" kit, shampoo, lotion, body wash, bottled water and fruit!
Was clean lines and contemporary decor. Lift stops between floors and there are 3 extra stair sets to reach the 7th floor breakfast area...but it keeps you fit! The lift plays bird noises which is quite fun.
Breakfast is really good, we had it included when we booked, good choice buffet breakfast, with champagne as a normal offering of drinks (no extra charge!)
Afternoon snacks also amazing, we had an a large breakfast went out all day and were able to come back and have tea, coffee and sandwiches and cakes ( all complementary) just go up to the breakfast floor and help yourselves.
Lovely hotel. Set in the west side of Berlin, so if you are going clubbing and want to be in staggering distance this hotel is not for you. However if you don't mind getting the underground then that's easy to use and cheap. 6.50€ for an unlimited day ticket for zones A+B which can be used on the U & S Bahn and the Bus as well. Also they provide free maps at all stations.
Staff were friendly and informative and even provided maps free of charge on arrival.
All in all I would visit again.