4 21 year olds looking for a four-room apartment in Rome for the months of June-early August

I am looking for an apartment with four beds and a kitchen in Rome from the dates of June 2 through August 4.  My three friends and I are all doing internships in Rome this summer and really hope to get a place together.  We are working in various parts of the city so ideally the accomodation will be in a location with ease of access to the metro and/or tram systems.