We were here for 2 weeks. What we liked was that the apartment is well located at only 2-3 min walk from Metro and Tram station, supermarkets, caffeterias and shops, food places on every corner. and half an hour walk on foot to the center of Athens.
The rooms are comfortable, the AC working properly, wifi was very good, and ther was an elevator in the building.
The host was responsive and very helpful!
What we didn't like (yet not the host fault, of course) was the loud neighnours - TV sound to the max in the middle of the night, talks and doors banging in any hour of the day and night. One of the rooms was on the street side, where you can hear the traffic quite loud, but this was still not as irritating and disturbing as the neighbours ignorant behavior. If you are noise sensitive, bring some earplugs with you.
Also, the appartment is quite dark during the day.
For some situtations that arised during our host responded quikly.