22 yo guy, looking for shared flat in Berlin

I’m from Rome, Italy. Looking for a place to stay from the first middle of September to the end of March. I‘m not looking for a specific kind of accommodation. I will study at HWR universit, economics field, so it would be great is the accommodation is near the university or if I can use public transport (possibly no long trip on foot, but no problem if I have to do many steps with metro). I’m a sporty guy, playing water polo for 10 years and would be great to find a team also in Berlin (looking for advice). I like to hang out and meet new friends. My English is not so good but I hope I can improve it over time. I don’t speak Germa, but Ikm going to follow a German course while in Berlin.