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How can i rent a flat if i'm a student from Russia, and i'll study at Universidad Rey Juan Carlos from 20/08/11 to 23/12/11?
It wont be easy to rent a flat just for 4 months.
it will be better to find a room for rent in a shared flat with other students.
write in google : alquiler habitación madrid and you will find several webs offering rooms rentals.
luck