We came to Athens for a week and our stay in Peny's appartment was lovely, especially the balcony! The appartment has everything you need, even if you want to cook.
The appartment is a bit far away from the center (30mins) but it was perfect for us since we could avoid all the touristic places if we wanted to rest.
There's a supermarket and two bakeries less than 5 mins from the house. I'd absolutely recommand them along with the cheese shop nearby (Aretousa). Most people in the neighborhood don't talk English very well but you'll be sure to find real local food! There's also three parks nearby which you can go to if you want to see the sunset from a high viewpoint.
The buses can be a bit annoying as they're rarely on time, and there's no place nearby to buy bus tickets so I'd recommand buying some in the center on the way back to the airport/back to Piraeus.
Peny was lovely and was always very quick to answer. If we ever come back to Athens we'll make sure to come back to this appartment!