We had a wonderful time in the appartment of Markus. He is a very friendly host, but unfortunately he wasn't in Berlin himself, so we didn't meet him, but he left us a lovely note and a bottle of wine to welcome us to his home.
The neighbourhood is very neat and peaceful and the U-Bahn station is a 10 minute walk from the appartment.
The only advice we would like to give Markus is that he should find an easier way to hand us the key, because we had to travel a great distance to collect the key.
Apart from that, we had a great week in this appartment and we would highly recommend it!