Frank's apartment is as specified in the description. It is close to a U-bahn station so nowhere in Berlin is difficult to access. The apartment is on the 6th floor of a residential block and there was no noise or disturbance of any kind from the neighbouring apartments. The apartment is spacious, clean and well supplied with amenities. We enjoyed our time there.
Unfortunately we didn't actually meet Frank and all arrangements were made via the Airbnb website. This worked perfectly well however. We were instructed where to collect the apartment key and given instructions about the apartment. All-in-all a straight-forward process.
We would be happy to stay at Frank's apartment again and can recommend it to others.