Gunnar and István are obviously seasoned travellers, and this is refelcted in the quality of the their hosting skills. Everything you need is available, communication is clear and it's all very easy. It's very useful to have such a good base to use to explore Berlin and it's one less thing to worry about. The train station is close, the flat is immaculate and obviously very stylish. The bed is comfy and the flat is quiet.
I would not hesitate to book again!