We stayed in Toni's apartment for a week and the apartment was lovely, modern, big, safe and clean.
A major plus is the amazing view from the living room windows of the glorious Acropolis to the right of a beautiful green tree. You can watch the Parthenon while sitting on the sofa in all it's glory, it's colors change at sunset and beautifully lit at night. Magical every time.
The apartment living room does face a busy road but you hardly hear the traffic with the windows closed. We opened the back facing bedroom windows for fresh air and there is great AC in all rooms. Bedrooms are comfy, dark and quiet. There was some feet banging noise a few times but nothing that disturbed our sleep. We actually didn't hear any noise from the bar on the street. it's more of a chill-classy bar. and returning to the apartment at all hours of the night felt safe.
The apartment location is really excellent - about 6 minutes walk to the trendy Gazi area filled with clubs and nightlife and about 10-15 minutes to the center of town with it's cute pubs, shops and restaurants, the major archeological sites and the Acropolis. There are also very nice restaurants just around the apartment. Vegan dinner at Rakor was excellent!
The M3 metro line is about 500m away which takes you right to the airport, or walk 7 minutes to the M1 line to Piraeus for some island hopping.
Our host Andreas was very responsive and courteous. He also offered we can keep our suitcases at their office after checkout until our late flight back (Ended up taking a locker at the city center). We had a very nice guy greet us at the apartment when arriving late at night and We also asked for and got two set of keys so we can return at different times.
You really won't regret taking this beautiful apartment while staying in Athens. You will feel right at home in this lovely full of life and history city :)