The place is perfect for traveling couples/friends, especially if you're always out exploring. Despite being a bit far from the city center by foot, the metro is very close by and a great option for short (2 stops) daily trips to the sites.
Giannis was very helpful and friendly, the self-check in/check out were also a big plus.
Things to keep in mind: the thin windows (a bit noisy but certainly not as noisy as other areas of Athens), no washing machine/oven (as clearly stated in the list of available appliances; nevertheless, you can always wash clothes by hand + there's a Lidl at the end of the street :D). In our case, the place has a 10/10 value for money, but it surely depends on your needs.
Overall, it was a very nice experience in a pleasant and safe neighborhood with easy access to all of the tourist areas :). I would certainly recommend Giannis' place.