My family spent 5 days in this flat (2 adults, 3 kids from 9 to 2) and it was a great location to visit Athens (no need to take public transportation or taxi, everything is walking distance from the flat). Irene and Apostolos were very helpful and answered all our questions super quickly, making it very easy for us to have the best time in the city. They provided us with recommendations for things to do, places to eat, and accessibles beaches with the tram.
The flat is big, well equipped and nicely decorated. It's true that it's located on a big avenue that is quite noisy but the rooms are on the other side of the apartment on a more quiet backyard.