4 persons private accomodation in Berlin

We are 4 persons, we'll come to Berlin from 5th of August to the 2nd  September to attend a summer german class at the University. We're looking for a small apartment, studio or room with private bathroom in Berlin, near to public transports.

We are clean, outgoing and we will probably be busy studying, so we are looking for somewhere that isn't too loud.We also enjoy  conversation and meeting other people, but as we are still 4, we think it is better not to live with other persons.

All student documentation on request