Thank you very much Andrea. Our stay was very nice and we had beautiful days in Firenze. Andrea's parents were waiting for us in the flat and explained everything. After that we got out and found out - the flat is really in the heart of Florence, but in a very calm street and we could walk nearly everywhere in 10 minutes, and not far from the flat we found a street where mostly the italiens went out :).
Communication with Andrea was very good,also the Check in and out, very incomplicated. I can heartly recommend the flat and Andrea - next time in Florence I hope the flat is free, so I can stay there again !