Here are some sites for those of you looking to rent a place
1. Just Landed site (also has job postings and general classifieds) Direct link for housing --> Just Landed Housing
2. Craigslist: Usually has lots & lots of rentals along with LOTS of classifieds of all sorts: Craigslist Greece Rentals
3. Spitogatos - This ones all in Greek but my fave, you get to search based on your budget, how big a place you want and area, PLUS most ads have photos! Spitogatos
Have Fun!