Javier was very nice; I booked last minute (the day before) and my plane was late.
Despite of this he was waiting for me, showed me around the apt and explained me everything about the neighborhood.
He lest me a bike so despite the distance to the center that very really easy and fun to go around: bicycle is the best transportation in Berlin, so many infrastructure for it.
The apt is big, very quite, has a nice balcony.