First, Maria is a very welcoming and pleasant host. She saved us a parking spot on the street and after showing us the apartment she also showed us around - where the supermarket, bakery and recommended restaurants are. She also provided a highchair and some toys and books for our kid.
The apartment is very spacious and the courtyard is nice and spacious too, as shown in the pictures.
The location is fantastic - 6 minutes from the Evangelismos metro station and 3 minutes from the marble stadium. If you don't mind walking - everything is at reach by foot, including the Acropolis, Syntagma square, Monastiraki flea market and even mount lycabettus.
The price and flexibility were also fair.

We had a great time and would definitely recommend it and stay there again if in the area.