The apartment is great. It's super clean, looks modern and is quite comfortable. Kitchen is fully equipped and fridge is spacious. The area is quite quiet as well, which was nice during the evenings. The location is not too bad either, being a short 10-min walk from Filopappou hill (amazing view) and a 15-20min walk from the entrance to the Acropolis. There are also a few great restaurants and bars a short 5-10min walk. There's a supermarket literally down the street, which was very convenient.
Marios was very hospitable. He bought some water bottles and fruits for the check-in, and the flat was fully equipped (coffee machine, laundry machine, good wifi, TVs with Netflix, etc.). He was also kind enough to share recommendations for places around the area. Overall a great stay.