Daniel and Sonia are very nice hosts. If you need anything, just ask them!
Their apartment is humble, but the best thing about it is its connection to public transportation. Within a 2-12 minute walk, you have access to trams (M13, 50, M1), the U-Bahn (U2), and multiple S-Bahn lines (S1, S2, S8, S9, S25, the Ringbahn, etc.). You are also within walking or tram distance to a selection of supermarkets like LIDL, REWE, Alnatura, or at the mall, there's Netto and Edeka.
Daniel and Sonia's apartment is affordable, while still very connected to the more well-known and/or touristy spots in Berlin.