I need Accomodation for a month

I need a single room in siena or near the Siena for a month. I am Alireza, 35, male, student in postgraduate degree of Language and mind; Linguistics and cognitive studies in university of Siena. I am a newcomer student in siena and since I am waiting for getting a dormitory by DSU in middle of december 2016, so I need a temporary accomodation for a month. I prefer a single room in a shared appartment in or near the Siena City.