Kostas' studio was exactly as advertised. Even if the atmosphere and the decorations in the room might not be appreciated by anyone, the apartment was tidy and neat. All necessities were there and there was absolutely no problem with hot water or heat (no central such, but the A/C worked just as well). Being greek myself (not from Athens though) and aware of the history of the area where the studio is situated, I was initially a bit concerned about safety issues. And the truth is that the building is not so welcoming from the outside, which is also the case for the common areas (entrance, elevator, staircase). But Kostas was reassuring that the building is safe and nothing serious has ever happened, which turned out to be true. The surrounding streets are flooding with cafes, bakeries and restaurants offering a variety of meal options.
Kostas was an excellent host. Timely communication in view of my arrival in Athens and then very quick response when talking about the details of checking in. He welcomed me with a box of greek christmas cookies and was more than happy to answer my questions. No problems during checkout, even if I left the studio a bit later than 12:00.
In my opinion the most important advantage of Kostas' studio is its location. Literally a stone's throw from the Monastiraki metro station from which you reach the airport in 45-50min! In the heart of the city with lots of options for shopping and eating, I would definitely recommend it to those that spend only a few days in Athens and wish to take advantage of every minute of their visit!