Benedikt supported me by message and phone but I never met him. A woman near the apartment was supposed to give me a key, but my flight was delayed and she went home without leaving the key. When I arrived there at midnight, I had to find a hotel, walking around Berlin at 1 am with big luggage. Benedikt was very supportive but this kind of trouble can happen when host is not nearby. I think I will not use Airbnb anymore...