single Apartment in Berlin

I am Gogoua habib, I am from Côte d'Ivoire, a very nice and developping country in West Africa. I am a worker but I am nown doing a master in Technical University of Berlin (TU Berlin). I am Christian and I am actually in Egypt in Campus El Gouna for my winter semester with TU Berlin.
I will be in Berlin for my summer semester from March to October 2017. So I want an apartment for this period. I want an apartment in Berlin not so far from Technical University of berlin (one hour and half max). I want a single room in an apartment and furnished with a bed, Kitcken and a bathroom. I am married but I will live alone. My wife can came later to visit me. I can share the apartment with others but I must be alone in my room. I will be gratiful to have an answer before the fifteen of February. My job is sure and I will can pay my rent for each month before the beginning or I can pay two months before. Thanks you.