Sigrid is a fantastic host - although we didn't meet her, she arranged for someone to be at the apartment to meet us when we arrived, and had a full list of excellent recommendations for the neighbourhood. The apartment was one of the best airbnb's I've stayed in - spacious, clean, fast internet, with a great kitchen and balcony. Perfect location, we rented bikes and saw everything we wanted to see in Berlin. I would definitely recommend this place.