For some reason, Zarenhof was grated as a four-star hotel. It is, thogh, a stree-star hotel by any standards. The breakfast is average and costs 12 euros. Six euros would be an appropriate price in Berlin, and the hotel's breakfast is better be avoided, especially in Berlin that is famous for it's great breakfasts. The Indian restaurant next door is one of the bests in Berlin.
That being said, the staff in the hotel are super friendly, the location is terrific and staying in Zarenhof Prenz is a great value for money.