21 year old student looking for a single room in Milan

I am a 21 year old student who will be looking forward to studying at politecnico di Milano, Bovisa campus starting September of 2015. So Im looking for a suitable single room, preferably in  a university dorm, for my stay. I also need the room not to be very expensive, a maximum of 550 euros for example. Also, the closer to Bovisa the better, although I wouldn't mind it if I was a little far. Even a single room in an apartment would be a good idea, although its my second option.