We had a really nice time at Antonio's place. The apartment is three minutes away from the metro station and from lots of buses. It took less than ten minutes to get to Alexanderplatz if we took the metro and about fifteen minutes to get to the centre of Berlin (or half an hour if we walked).
We didn't meet Antonio but the communication with him and with Stefano was really good. They were very helpful ! The apartment is really nice and the neighbourhood is very quiet. We'll definitely come back!