I had a lovely stay at Anton's flat! The apartment was as listed, and the neighbourhood is great with its many restaurants, cafes, and bars. It is also well-located; it is very close to U Eberswalder Str. and several tram stops, so it is easy to get around the city.
Although Anton was not there to greet me, he was answered all my questions about the flat and the neighbourhood promptly.
If you're looking for a great place to stay in Berlin (and specifically Prenzlauer Berg), I recommend staying here. Thanks again, Anton!