Everything went smoothly, Achim was reactive and the flat itself was good. It was well decorated and everything was very clean. We were a bit surprised that the place was the personal home of Achim and his family. But the house, despite looking like a family home, is more built like a set of 3 independant flats (common staircase, with dedicated keys and intercom for each floor), which gave us the autonomy we were aiming for. I recommend this place for a trip in Berlin👍🏻