Anyone with an idea as to where to find living accomodations in Greece?

I was talking to a friend of mine, her and I were complaining about college starting back up again and I just made the comment that I was going to take the semester off and go live on a Greek island (specifically Santorini). it just got me thinking, that if I ever really wanted to do that, would it be relatively affordable for someone who’s not in a wealthier class? and does anyone know of some sites that I could check out just to get a basic idea?

Disclaimer: I’m not asking if it’d be a good choice, and I’m not saying I’m planning to do this any time soon, just a “for future reference” sort of curiosity…