Gerhard met me at the house to hand over the keys and go over everything about the flat in person. He was always available and ready to help throughout my stay as well, providing helpful tips about local businesses and things I should keep an eye out for while in Berlin! The flat is great, right next to parks and a 10 min walk to access to Berlin's extensive S-Bahn train system. 10/10 would recommend to friends and stay there again.