The location is ideal since it's directly across from public transport and walkable to so much. We arrived by train at the Berlin HBF, so it was only 2 stops on the S-Bahn to the apartment. The check in process was problematic for us because we arrived on a holiday and the Ossena restaurant was closed, so we had to wait for Alexander to bring us a key, which he had not planned. If the restaurant had been open, I think the system for check in would be no big deal.
Once inside, we were comfortably settled. We had 4 of us and plenty of room in the large 2 bedroom apartment. It was very quiet, which was a surprise since it was so close the S-Bahn station. The elevator was convenient. The bathroom has a washer but no dryer; however, there is a heated drying rack and an additional rack in the shower, so we successfully did laundry. The immediate area has a lot of food choices and a small market. I recommend the Berlin walking tour through Trip Advisor. It meets steps away at the Starbucks.