We really enjoyed our stay in Berlin and can highly recommend the appartment. Besides the fact that it's spacious, it's well equipped and has good beds.
First of all Bjorn is a great host and was there even before the time we agreed up on.
The appartment is situated in a very agreable part of Berlin, very close to public transport and plenty of pubs and restaurant as soon as you walk out of the door.
A supermarket is on walking distance, you can also park your car there in teh underground public parking for € 10 / day !
If the weather is OK, we recommend to rent bike at "Berlin on Bike" which is situated in the Kulturbrauerei (same location as the public parking and supermarkt). From the appartment it's a 5 - 10 minute trip to the city center.