Fantastic location to visit all of Athens’ highlights...ON FOOT! We only used public transport to get from the central station to the apartment, all the rest we walked.
There is a nice little playground for children directly across the Kallirrois street.
All in all we had a great stay, and the washer was very welcome to clean our clothes. Bring your own laundry powder.
I suppose this apartment is as quiet as you can get in Athens: it’s tucked away and the windows are away from any streets. Still, there was still significant traffic noise at night.