Fried is truly a good host. Unfortunately we couldn't see in person, but he gave me good all necessary infos and recommandations about the flat, restaurants, and markets.
It is my third trip in Berlin. Spending time at Fried's flat is one of the best travel experiences I have ever had. I felt like staying at home. It was really lovely, cozy, and warm. The neighborhood is not only good, but also you can take U-Bahn, S-Bahn, and tram easily. It's a safe neighbor. There are many families living in Prenzlauer Berg. When I walked around, I was easy to find good cafes, restaurants, bars, and shops. I will definitely recommend Fried's flat and I'd like to stay it if I visit to Berlin again.
My friend and I have kept talking about Fried's flat where is the best accommodation ever so far. Thanks a lot for offering your flat! :)