We very much enjoyed our stay.
Frank handed over the place in person and made sure we knew about all the details we might need to get the most out of the place.
The place itself was very clean and very well equipped. We particularly enjoyed having not just a terrace to enjoy the great weather outside - but also an AC (very rare in Germany) to be comfortably cool inside.
Frank was always easy and quick to reach - and even after we left, he went out of his way to ensure that some of the mail that arrived too late would still reach us in the end.