If you are traveling as a couple and are looking to stay a few days in Athens, this apartment / house is perfect. The location is absolutely great for exploring the city by foot, and the views the apartment offers from its balcony and rooftop terrace are stunning.
The apartment is clean, well equipped, and suitable for two persons (could accommodate one more person if the sofa in the kitchen is used as a bed). Both rooms (kitchen and bedroom) have separate air conditioners, as they are on different floors of the house.

The host, Παναγιώτα, is pleasant and helpful; and it is easy to speak with her and ask questions. I immediately got in contact with her after my booking, and she was very helpful, and quick to respond, to all of my questions. The apartment is at walking distance from two of the major metro stations, Monastirki and Zyntagma, which are both on the blue line (same as the airport metro station).
I recommend the apartment and the host to anyone planning to explore and stay in Athens for a couple of days.