Sia is a great host, very helpful and polite. She always responds on time, giving valuable information about the apartment and its surrounding area.
Regarding the flat, access is very easy and the accommodation is located in central Athens. Tube stations are nearby (Syggrou- Fix & Acropolis) and you can actually walk to the Acropolis museum (only 10' away). The flat is tidy and super clean (way better than a hotel) and Sia made sure to leave clean towels and chocolate treats.
We were very satisfied with the flat and we believe that it's worth its money. However, we couldn't ignore two issues. First, there were no curtains on the window which made us feel a little bit uncomfortable and second were the extremely noisy neighbours who were making a lot of noise at 3 am. Obviously, that wasn't Sia's fault but it's worth mentioning if you are a troubled sleeper.
Overall, we would definitely recommend Sia's flat and we would love to visit again.