We spent a great 3 days long week end in Kolonaki, george's apartment.
The area is residential and superb, very quiet, this is what we were looking for.
3 Metro station from center or 20’ walking distance to go downtown.
But the area is also very nice with a lot of shop, great café and restaurant we enjoyed as well.
Just be aware that the area is an hill and if it is easy to go down… you have to go up for return 
The apartment is exactly as described by picture, very comfortable.
It is on 0,5 Floor at Orange Blossom trees level… very nice & easy to access from residence entrance.
George team has been very professional, able to manage a late check in and always on e-mail / phone for request & information.