Close to the U6 and U9 subway, the M13/50 trams, as well as buses, and also less than 25 minutes from Tegel Airport. Elina’s apartment is well-connected to all the other parts of Berlin. There are also so many supermarkets (Penny, Netto, Bio Company, plus a number of local vendors/fruit markets), drug stores (dm, Rossmann, Müller), and shops like H&M right down the street, so your immediate shopping needs will be met.
The three of us really enjoyed staying at Elina’s place - very comfortable for three people. Plus, it was even larger than it seems in the photos. If the room is still available the next time I’m in Berlin, I will definitely stay here again!