23 years old boy from Prague looking for accommodation in Coimbra for erasmus

I am 23 yeras student from Prague, and I am finding the accommodation in the Coimbra for 3 monts from today. I need the private room in some students flat. Important it must be clean and there must be private room with bed. I will be from 11.9.2016 til the half of december I think. Now I am in the hostel but I need my room for long time because tommorow start the semester. Thank you for your offers.