Overall really nice stay at Kοnstantinos' place. Location is quite good, 15 minute walk to Agora for example. 5 minutes to metro. And really good fine dining restaurant (Aleria) literally around the corner.
Good communication with Kοnstantinos and really appreciated possibility to check-in earlier than normal check-in time and also possibility to leave our luggage at the roof top for few hours after check-out.
Place was clean and had almost all essential things you would need. The 3rd floor apartment did not have iron and not aircon in the bedrooms (just fans). Nice big balcony and the roof top terrace is excellent. Great to have food delivered there if you don't feel like going to a restaurant after a busy day.
The apartment had some eletric wires coming out from the walls and especially the one next to the shower gave the the creeps.
I you don't mind a little bit more rough neighborhood (I enjoyed it!) the place is great! Not that it would be unsafe or anything.