Excellent experience: the apartment is clean, spacious and very close to the center (only one metro station from the acropolis). Nikos was a perfect host: I asked him many questions about restaurants, events, renting cars, suggestions about places to visit in Athens and around, and he was always friendly and open to answer and give advices.
I would strongly recommend his apartment for those who want to visit Athens. Hope to see you again, Nikos!