Having been to Athens a few times, this was my first time staying within walking distance to all of the major sites. This unit is in an ideal location for you to navigate the Centre of Athens. It's close to a nice bakery, hotel with excellent breakfast, and strip of restaurants for lunch or dinner and wine or regular bars for a night cap. Biggest pros for me were the bed (most comfortable mattress on our trip, which is so important for a good nights rest), cleanliness, and a working, clean washing machine.
One thing to mention for Athens newcomers, it's near an area that you don't necessarily want to navigate by yourself, especially on foot, at night. The area that I mention is in the opposite direction of the main attractions, so most people shouldn't have a problem.
Aris helped hire us a car to pick us up and drop us off at the airport. Since we arrived late and departed early, this was a very good decision. We recommend this service.
Additionally, a good tip for travelers is to learn how to say the neighborhood "Psiri" and the street "Sarri." We were often with taxi drivers who couldn't read the phonetic spelling, but when I correctly pronounced the area, they knew exactly where to take me.