We had a lovely time at Alban's place!
Alban lives abroad, but he always responds very quickly to texts and e-mails, top communication from his part. His son lives in a separate part above the appartment, he welcomed us and showed us around, he was very friendly.
The appartment is very spacious with large bedrooms and a huge living room. The kitchen is well equiped and the bathroom has a good shower (there's also an additional shower in one of the bedrooms). There also a terrace where you can enjoy breakfast or dinner in the sun, if the weather allows it.
The appartment is at walking distance from a supermarket and the Nikolassee S-bahn stop, which gets you in either Berlin or Potsdam in no time.
Perfect place for your visit to German's capital!