Nikos's apartment is highly recommended. It is fully furnished and has a very nice balcony, Nikos is an excellent and communicative host. From the apartment you enter a lively area (okay, Athens is quite busy of course) with nice shops, bakeries, eateries, cafes and restarants. Around the corner on Fridays a nice authentic market. With a (brisk) walk you can reach many highlights of Athens and the Metro. Again, highly recommended.