Our staying in Berlin was great. Apartment is in great neighborhood, very well connected. You are couple of station from Postdamer Platz by S-ban. Small and cozy, clean, across the street is bus station, bakery and supermarket. The hosts are very pleasant and helpful, they stay up late and wait for us to arrive. WiFi isn't very good, which is annoying if you want to plan your day, but it is good if you are in kitchen or bathroom. If we are coming again in Berlin we will probably stay in same apartment.