Efi and Anna are very responsive in communications and suggestions.
I highly recommend their suggestion for taxi (not metro) from airport. They are able to arrange for driver to meet you and help you.
Location, location, location. The apartment is perfectly situated directly across from Acropolis metro stop. Lots of very good food options just outside door of apartment. Strong AC, very hot water, quiet/courtyard facing apartment. Convenient washing machine in apartment. Everything you need to set up a temporary house in Athens.
Efi and Anna had lots of tips for places to eat, drink, shop, etc.