Nasos met us at the metro station, he showed us around and gave us some great tips on what's best to do in Athens.
The location of the apartment is amazingly convenient - walking distance to all the sites. The acropolis is two blocks away with a 5 minute walk to the metro. There is a supermarket 2 minutes away, as well.
The apartment itself was very clean and perfect for 4 people.
Thank you again for your warm welcome Nasos!