Pro: huge apartment, nice rooms, kitchen well stocked, during the week it's quite. Good value for money. 8 min walk from the Keramikou metro station which takes you right to the airport. Maria was also very quick to answer messages and sent through lots of information about where to eat and what to do, which was really useful :)
Con: the apartment is right across from the Kafenio ta Kanaria where they have live music till 2am on the weekends (without earplugs it was not possible to sleep), the apartment is also a bit dark and in a not so nice part of town.