Hands down THE best place I've stayed in, during all my travel in Europe. Sparkling Extra! clean, spacious apartment and great value for money. The location is unbeatable. As soon as you step outside the door you can see the Acropolis hill, which is the highlight of Athens, especially at night when it is illuminated. All the main attractions of Athens are within walking distance like Monastiraki, Syntagma square, Plaka area etc., plus you will find tons of shopping and dining places nearby. But even though it's so central, it is located in a quiet hidden small square, that's why it's not noisy, and as someone who doesn't sleep too well when I travel, I had no trouble sleeping at all! The kitchen is fully equipped, Netflix access on the TV, you won't get bored in here.
The private really big balcony was perfect to relax and have your breakfast there. The Acropolis view from the shared roof terrace is also amazing, especially illuminated at night. I could not have hoped for a better, cleaner apartment, location, host and experience. I will definitely be back and highly recommend it to anyone visiting Athens.