Nikos is a wonderful host and his apartment is lovely! The place is close enough to the Acropolis and the Plaka area that you can walk there, while at the same time far enough that it's quiet at night and in the morning. The area seemed safe even very late at night and it's well served by public transportation. There are also quite a few grocery stores and great places to eat nearby. I would definitely stay at Nikos's place again in the future, and I strongly recommended it to anyone visiting Athens.