Peters place is well situated and very close to the station, although the road itself is very residential, there is a cafe downstairs but nothing else. That said, it is within easy walking distance to several lively nightspots and the fact it wasn't downstairs on our doorstep meant we explored more and went to different places. We had no trouble at all returning late at night.
Peter was always easily contactable and very helpful at check-in / check-out.
We had a great stay in Berlin!