We didn't meet Heinz, we got our keys from the rent-a-appartment company. The communication with Heinz was well trough e-mail. He was friendly and give all the information we needed. Only one thing; the parking is not for free like it said in the advertisement. Or you have to walk far or you have to pay 10E a day for a car. This is what we did in the end. The apartment and the location is incredible; we had a beautiful view on Unter de Linde.