4 architecture's students apartment

Hello everyone,
I represent a group of 4 students of architecture (3 girls and 1 boy) from University of Bologna that will stay in Berlin, since about 01-09-2015 to 28-10-2015, to prepare our master degree thesis.
We are looking for an apartment in which we can stay and study for this two months, preferably near a metro station or near any other public transport stop. We'd like to sleep in single beds but we have no problem in sharing beds between us (for example, two double beds). It's necessary that the apartment is equipped with internet connection because we need it for our studies.
We are all no smokers.

Best regards

Michele Rinaldi