You land in Athens to start your Erasmus year and you have nowhere to sleep ... do not worry ... the best advice i can give is to go first to take a bed at the Youth Hostel Victor Hugo (16 rue Victor Hugo, near the Omonia Square). It's not too expensive, about 15.00 euros per night. At the hostel you will find young people in the same situation as you, ERASMUS desperate for a pad, it is an opportunity to share your tips and maybe consider jointly seek a roommate. There is also a board with advertisement for room to rent.