So many places in Athens claim that they are located in the perfect spot, so it was hard for me to believe anyone. Rest assured this property is in the BEST location. It's on the famous Ermou Street, which means you can get pastries 24 hours a day (year-round). The Hermes Perfection is only a 3 minutes from Syntagma Square & Metro and a 7 minute walk to the Plaka. Every listing wants to talk about how close they are to the Acropolis, it's true nearly everything is, so base your decision less on this (the Hermes is an exciting 10 min walk from the museum).
The flat is exactly as you see it in the pictures. The flat is safe, has a good shower and the bed is comfortable. It had everything we needed in the kitchen and there's a little store around the corner to buy some food.
I can't say enough about Planos, he was extremely responsive during our stay, he was very thorough on check-in (he even greeted our cab as we pulled up to Ermou) and made a few custom recommendations on what we should do in Athens based on what kind of experience we were looking for.
If you are looking for a good base, conveniently located, that's quiet, safe and private, I would recommend this property and Panos!