When I was looking for an apartment in Athens, My priority was quiet neighborhood to sleep well at night, that's why I didn't wanted very central areas. From here, you can get to the center in 15-20min by walk, or take a subway which is 2 min walk from the apartment. The neighborhood is really very good, clean streets and quiet.
p.s. there is the best bakery nearby "Αρτο..ζυμιά"
I already miss their croissant sandwiches :((