Great place to stay to explore. We walked everywhere we went (about 33 miles in 3 1/2 days: wear comfortable shoes!) and even though legs and feet were aching the apartment was well-located so we could go back for lunch/a rest most days.
Apartment was spotlessly clean and we found it quiet at all times of day and night, even though it’s one block away from a busy road.
We used a combination of recommendations from Spyros/his team and our own research for food. Dio Dekares i Oka (Anastasiou Zinni 29) was very good and is a 15 minute walk from the apartment; Coffee Joint (just down the road) is also worth a visit. The best thing about both these places was the quality of hospitality from the families running them.
If you like olives go to Apiana (Theatrou 3) and Loukoumades Chanion (Sokratous 59) is a great little place for the famous deep fried treat. Also amazing coffee from Rizopoulos (Sofokleous 18). In the same area there is a great food market just off Athinas.
Enjoy Athens!