searching fo a room in hannover

i'm going to study german language in hannover and i'm looking for a place to rent for at least a three months (course lasts 6 months).
i am a 23 year old tunisian student and i don't smoke and I have no objection to smokers. i describe myself as a responsible person so i won't cause any problems fo you
as my stay in germany is only to learn the language.
i'm very intrested in renting a room from feburary to april, if you liked my stay in that period of time then we will renew the contract for another 4 months.