I would not recommend this hotel, very basic and not at all a 4-star Hotel.
The hotel did not even have extra keycards, so me n my friend had to share one keycard during the whole stay which made things difficult for us.
As our stay was to enjoy the nightlife of Berlin our room was not cleaned for 4 days, the housekeeping ended their work at 4 pm and they did not have any other staff in the evening to clean the rooms.
I also did not find the staff so friendly, even the hotel bar in the reception was bad and basic! Have before stayed in the select hotel check point Charlie and would rather recommend that hotel, if you wish to stay in the area of Mitte! For me this is the last time I am staying at a Select Hotel in Berlin.