The apartment was very nice. It's easy to access from the airport via train. Τhe metro station is also in 5min walking distance. The apartment was clean. Our only problems, which to be fair had a minor impact on our stay, was that the sheets had a bad due to humidity, and that the dishwasher was not working but I'm guess it will be fixed before the next guest arrives anyway ;)
In general we enjoyed our stay at Marc's place.