Bonn WG for American, May-July

I am looking for a WG room for a friend who is coming from the States and needs housing from May until July. He is 20 years old and is doing an internship with a Christian student group at the University of Bonn called Connexxion. He is studying International Business and doesn't speak much German. He is looking for a furnished room, from May 1 until the end of July, with preferably all male room mates. It would be preferable for the WG to be in the south of the city or in reasonable distance to Poppelsdorf or Bonn Zentrum.