43 year old man, looking for accommodation in Berlin

I'm an American student currently living in Stuttgart and need room to complete my preparation courses in Berlin. I'm a very active person who loves sport like: running, biking, and swimming. My carrier passions are History, Anthropology, and Genetics and after my preparation course, I'll apply for the North American Studies at Freie Berlin University. I'm looking for a small student room with internet (WG) that I can study comfortably with good friendly flatshare Tenents.