Paul was very accommodating when we sent him a very last-minute request to stay at his place. He answered quickly and was able to provide us with a baby-gate for the stairs, which was the one concern we had staying in the apartment with two small children.
The apartment is small, but had everything we needed, and it is in a great location if one wants to stay in a less-hip, more-beautiful part of Berlin. It is close to a couple of lakes, and is also very close to the Mexikoplatz S-Bahn station from where one can easily take the train to other, more central parts of Berlin. There is also a lovely market at the station on Saturdays.
We had a great, relaxing weekend.