I had a wonderful stay at Katharina's flat and would highly recommend it! The place is spacious, well illuminated, extremely close to public transportation and to many wonderful places to eat out even on a small budget! The only minor thing I could point out is the fact that the curtains in the room are of a very light color, so the sunlight tends to illuminate the room in the early morning in the summer. But a part from that, this airbnb is ideal and Katharina is a very caring host who will help make your stay in Berlin an enjoyable experience :)