The stay at the apartment was great. It was very clean and was perfect for 2 people. Comfortable bed, good shower, air conditioning and a good amount of space for the two of us for the week we stayed there. The communication from Bill & John/the company was really superb - our flight was delayed by 2 hours so we didn't arrive into Athens until after midnight. As that was after-hours check-in, they made sure to call me/text me/chat with me through whatsap/airbnb to let me know we could pick up the keys at a nearby hotel that had 24/hour reception. They ensured to communicate with me until they received confirmation that we were in the apartment safely.
The location was really great - we could walk to all of the sites we wanted to easily, had a great selection of cafes, restaurants and grocery stores nearby walking distance, and also was easy to walk to the metro when we did want to get to the Piraeus port to catch a ferry for the day (or the airport). There were a few restaurants open late at night by the apartment building which was nice as I felt safe walking back at night. The apartment was on the 4th floor so was totally quiet and couldn't hear any noise from street. Overall, it was exactly what we wanted and will be booking it again the next time we are in Athens.