The apartment was really perfect. It's been renovated and it looks awesome. There are A/Cs on both bedrooms, as well as in the living room, and they work really well, which is a must especially if you're visiting Athens in July/August.
Panagiotis and his family were really nice, giving us tips about bars and restaurants to go to, and a little electronic travel guide to Athens.
Also, they stocked the fridge with some delicious fruits, jam and some other breakfast items, which were really appreciated! I wouldn't hesitate in staying there again when I come back to Athens.