What a fabulous place which easily scores five stars in all categories.
I was here with my family for a conference so I needed a location that was close to the city center. The apartment itself is spotless and the view from the balcony was amazing. We arrived at Athens late at night and Olympia had no problem accommodating our schedule. Communication was practically instantaneous and everything in the apartment was clearly labeled with nice touches everywhere (example: water and orange juice in the fridge, welcome chocolates, etc) The wifi was strong (according to the kids who are addicted to netflix) and supplies like towels, shampoo, toilet paper are available in abundance.
If you're looking for a place to stay in Athens then look no further. I would highly recommend Oylmpia's apartment and I would definitely stay here again.