Myself & the wife stayed at this hotel between Xmas & New Year 2012 for a 3 night city break to see the sights of Berlin.
Excellent functional hotel; there is an underground reasonably priced car park for the guests of the hotel, free wifi which you can access in your room (I've had to pay for this service at supposed 4* hotels on "sunshine holidays" so this is a big plus for me), and the quality of food at breakfast is excellent to fuel you for the day's sight seeing. It isn't the most central hotel (perhaps a 15-20 minute walk from the Brandenburg Tor which is nothing really) though it exceeded our expectations for the price / day.
The room is also very nice & functional.
Can't really criticise the hotel as it was just a place to sleep & have breakfast. Clean, functional & reasonably priced.