PhD Potsdam

I'll be living in Potsdam for six months to complete part of my doctoral studies. I currently live in Brazil and participated in a selection process that granted me the scholarship. I have the documents issued by the Brazilian government and also the letter of acceptance issued by the University of Potsdam as a guarantee for the rent. I'm a very careful person and I'm sure the tenant won't have any problems with late payments or indiscipline. I'm looking for a quiet place within easy reach (on foot or by public transport) of the University of Potsdam. I'm looking for a private apartment with a bathroom and a fully-equipped kitchen. I don't need a huge space, but it should at least be comfortable. It would also be interesting if the apartment was close to a supermarket. I have a brother who lives in Germany and he can visit the apartment if necessary.