26 years old greek philology student, looking for accomodation in Athens

Hi, I'm Enrico, an italian student of greek philology. I will attend the summer school Thyespa from 1st june to 13th july. I'm searching for an accomodation, preferably a room in a shared apartment. I'm a clean and easy going person and I like meeting new people from all over the world. My budget is 500 euros for all the period (45 days moreless).