Looking a single room for rent in Berlin in a shared apartment

BERLIN
I am Mir Mehedi Hasan from Bangladesh, will be moving to Berlin around the first half of November for PhD study at Humboldt University of Berlin. So, I am looking a single room for rent in Berlin in a shared apartment or any student dormitory for long term. My budget is around 500 Euro and my preference is close to schönburg, Berlin.

Facebook:https://www.facebook.com/mir.suny