Good, basic place to stay for a few nights in Athens. Good location within reach of Acropolis, Plaka and Monastiraki and easy access to/from the airport via Syngrou-Fix station. Great amenities such as Aircon and washing machine. Kal is a great and responsive host. My clothes dried on the rooftop in a couple of hours as it is very sunny and windy up there. I'm a regular in Athens and will book this place again when I come to visit.
One thing to note is that some of the noise from the street and from the neighbours (when they're having a loud conversation) can be heard from inside the flat even with all the doors and windows closed. Make sure you bring a good set of earplugs if you're a light sleeper.