Niko's apartment in Koukaki has been one of my best experiences ever using Airbnb.
The place is one of the best apartments I've seen in the area (and I've seen several while in Athens). You will find everything you need for short and long stays. I stayed there for more than 4 months and I can say it really felt like home. When I say this, I mean it.
First of, Nikos responsiveness is exceptional, like I had never experienced before. Whatever you might need, he'll help you out right away effectively and efficiently. Communication with him has been a real joy. He also offered me a few treats during my stay in his apartment, a courtesy I really appreciated.
The bed is comfortable and spacious, the bathroom is renewed and very clean, the kitchen has everything you need and it is modern, with a vitro cooktop, a good refrigerator and a full oven.
The living room is comfortable, clean and luminous, especially in the mornings, with a very nice terrace with small table and chairs, awning and connecting entrances to the living room and bedroom. The windows are modern and close perfectly, so no noise, no winter cold will disturb you at all.
You will find literally anything you need two steps away from the apartment.
The neighbourhood is lively, two steps away from the Acropolis and the neighbours are a joy to talk to. I even made some friends among the neighbours... lovely chatty people with which I could practice my recently acquired Greek language skills.
Another thing I really appreciated is that, even though you will be in the heart of Athens, by night you will be in a very silent area. This really surprised me, as two steps away there's plenty of cafes and restaurants filled with people from morning until night.
However, I can say I had perfect sleep in perfect silent each and every one of the many nights I spent there.
Nothing but 5 stars I can give to Niko and his apartment, as It was all excellent.