I will talk to you as an ex local who lived in Athens and now lives in UK and comes to Athens as a tourist.
I preferred the little flat at first because of the area. It is one of the three best places for nightlife in Athens or for morning coffee. It is also so close to the ancient monuments of Greece. The metro is so close but I would suggest you walking there as the distance is so beautiful plus the fact that the view from the balcony gives you a chilling mood and a view of Acropolis which is very beautiful especially at night.
So it is a perfect place considering the spot.
Besides that Konstantinos is a great host and a great guy. I would suggest him to you as the flat has everything you need as Konstantinos took care of it. Also you will never face a problem with him as a host. Always willing to help and I feel so honored to meet him even now that I am living in UK
I will definitely book it again when I come to Greece.