Room in shared apartment/residence/dormitory

I'm an italian student of Natural Science from Florence. I will do my erasmus in Tubinga next winter and I'm looking for a single and furnished room in a dormitory or in an apartament shared with other students. Period is from October 2013 to March 2014. I prefer to move in the first days of October (between 5th and 10th), but if not possible it's ok anyway. I have no preference for my flat-mate, but I like to know new people from other country. I would find mates for study and also to spend our free time to live the city (sightseeing, party, etc...).