The flat is brand new, there are still some minor things missing which is not a problem at all.
Petros is a nice host, he was welcoming in every way and assisted us with everything. Check in and out was totally easy.
A big plus I want to mention is his wifi-box that you can carry around the city and charge via USB which allows you to have free wifi everywhere you go!
Unfortunately the flat is very badly isolated. It is on the 6th floor near one of the biggest streets in athen where there are a lot of cars (3 lines in one direction going right near the house) driving fast and noisy all night. We were barely able to sleep in the flat because you can hear every car through the rather thin windows. This is neither in the description or mentioned somewhere yet, so if you have even slight troubles sleeping with noise, you will not get 1 minute of sleep here. That's also the whole reason we had to subtract 2 stars because it's really insanely loud all day & night.