My mother and i had a great time in Athens. We got picked up from te airport late at night by a trusted driver.
The appartment is very central and has a metrostation across the street. You can buy a metro ticket for 24 hours for €4,50 p.p. And traveling by metro is very easy.
You can also use the website: www.metrocazar.com and plan a route.
The Appartment is nice, the bedrooms looked great and it felt like home. I would really recommend this appartment.