Excellent location: view of the Acropolis (!), metro station Akropolis and (impressive) Akropolis Museum across the street, super market around the corner (closed on Sundays), good restaurants with friendly personell literally downstairs and cosy historical Plaka neighborhood a short walk away.
The apartment is as shown in the advertisement and very clean. Noisy street sounds can be cancelled by simply closing the double glass balcony doors. Good and quiet airconditioning. Very large living and sleeping rooms, relatively small and windowless kitchen. Coffee (for classic espresso machine) and sugar available; water and juice in the fridge. So if you arrive late, be sure to bring something for breakfast with you.
All in all a very good base to discover Athens from!