This Apartment could not be better placed I know the area well as I lived a few blocks away for a year and was delighted to find somewhere so well priced in the old neighbourhood. You can get everywhere more or less on foot. There are no great views but it is clean and though it has an internal sitting room come kitchen it has all the facilities WiFi worked perfectly, bathroom small but functional. Main bedroom very big second bedroom more than adequate if you needed it.
As someone else pointed out central Athens like any other city can be noisy but really you should be out there too so who cares. I picked up the keys from the helpful lady in the green grocers down below and knew the restaurants in the area, its where you come for good cheep japanese food in central athens!
The apartment is typical of the area where the ground floor is shops a couple of floors of offices and people living on the upper floors. The floor of the apartment seems to be filled with empty offices so it feels very private.
Never met the hosts but they were very efficient communicators.
Will be staying again if they let me.