Peter and Fenfen are very good hosts. We stay at the apartment about 4month, they helped us a lot in various ways. I used to live in Hamburg, Peter even drive us from Hamburg to Berlin.
About the location, there were several supermarket: Lidl, Rewe, and a small Asian market. Two Metro station, one train station.
About the apartment, it is very functional with super nice kitchen.
We had a really good time at the apartment.