Exactly like in the description. We had a very nice stay in Berlin. The place was extremely quiet.
Regarding the public transports, there is a delay between two buses or S-bahn, which can be up to 20 minutes. In winter, waiting can be cold (and buses do not always go in the city center, they sometimes end before). Plan accordingly (the official Web site at bvg.de is OK).
The flat is OK for a couple and the supermarket nearby is convenient. And the park/forest very close is great.