A generally very positive experience, but with room for improvement, so:
Pros: location! Not our first time in Athens, but this apartment's location is truly superb! Amazing neighborhood, clean, safe, close to center and with a lot to do.
The apartment is very clean (except for some of the dishes) and looks beautiful, the terrace is great and roomy, and the host's employee, Giola, was very very nice and helpful with absolutely everything. The shower is awsome, with great water pressure and endless supply of hot water. Only thing missing amenities-wise was a microwave.
Cons: the air-con! The thermostat is set at 21 c° and is unchangable (the guy who greeted us said something about calling somewhere if we want to change the temperature, but that it was really complicated and he was unable to do it himself, and didn't leave us with a number to call so we didn't even bother). This temperature is fine in general, but during the rainy days it felt quite cold, and we could only wrap ourselves with every blanket in the house, and in the sunny days we had to wait quite a while before feeling comfortable after walking around all day, opening the terrace door didn't help, because there were lots of mosquitoes outside and the tree that grows nearby had a rather... distinct smell.
There was also no dish soap, or washing powder for the washing machine, so we had to buy a whole bottle of it.
A small round hotel-style bar of soap for the both of us for 10 days was also really insufficient.
Two rolls of toilet paper also didn't do the trick. So all in all, the apartment had a little less perishables than what we got accustomed to on Airbnb, on all fronts (no dishtowel, oil, spices, shampoo and other "pamperings")
In summation, other than these small things, our stay was great, we do recommend this apartment wholeheartedly.