I really enjoyed my time and Athens and would highly recommend Hermes' apartment. It is extremely convenient to attractions, bars and restaurants - within easy reach of food that is targeted towards tourists but also a great blend of venues that are full of locals. The apartment was charming and clean. Hermes was very responsive before and during our trip, helping make check-in a breeze.
One small thing to note: it's important to turn on the switch to the water heater 15 min before you shower. My girlfriend unfortunately had to take some cold showers because she kept forgetting, while my showers were piping hot every day so I didn't experience this at all. I think this is common in Greece, and I wouldn't hold this against the host/apartment.
I would gladly stay here for our next visit to Athens and highly recommend this apartment!