We liked Vensa's apartment.
It is just in front of a nice bakery with Greek pastry that will save you making breakfast if you are in need for a quick bite.
The house is very clean and have a very good kitchen, so if you like to cook you are in the right apartment.
When we came in Friday we got directed to a market that is 2 minutes walk from the apartment and it was very high quality and relatively cheap.
The distance to the center from the apartment is just 10 minutes walking to the metro and from there is 5-7 minutes and you there, near all the restaurants and all the sites you want to see in Athens.
In Short very recommended will come again, thanks Vensa.