Fillis's apartment is a great space to stay while in Athens. It has a homely feel plus it's located only 2 stops on the metro from Athens centre. It only takes 5 minutes to walk to the local metro and there are also loads of places to eat and grocery stores nearby.
Her place has all the amenities you need, and a lovely balcony to enjoy the local views.
I would definitely recommend staying at Fillis' lovely apartment.