The apartment is cozy, very clean, has all necessary amenities (including a coffee machine, complimentary coffee, fruit, water), a comfortable bed, and a gorgeous balcony with an amazing view of the Acropolis and the parthenon. The pictures don't lie, we spent every morning relaxing on the balcony just taking in the beautiful view. Furthermore, the apartment is perfectly located in the historic district of Athens - Plaka. It is a very short walk away from almost everything we did. Very convenient access to the airport via the metro at Syntagma square, two blocks away from some of the best gyros in the city, across the street from one of the most important Greek Orthodox cathedrals, in the middle of the shopping district, and directly above one of the best wine bars I've seen (2.50 euro glasses of some of the best wine we had all trip).
Most importantly, Dimitrios is a wonderful host. He ensure that we always had our privacy, and it felt as if we had the whole apartment to ourself. He gave us wonderful tips on where to go and what to do, all of which greatly enhanced our experience greatly. When we had a problem with our camera's memory card, he asked one of his tech-savvy friends to come by and help - he downloaded the pictures on the card and sent them to us so we wouldn't lose them. He also offered a day trip to the Temple of Poseidon and a seafood restaurant in Sounion that was a wonderful trip and absolutely worth doing.
Overall, a wonderful experience and if I am back in Athens I will definitely stay with Dimitrios again.