The University of Duisburg-Essen does not offer places in student accommodation itself. The Studentenwerk is the student services provider responsible for the student residences. You can apply to the Studentenwerk for a place in a student residence even if you have not yet received a letter of acceptance/admission from the University of Duisburg-Essen. The earlier you apply to the Studentenwerk, the better. You make your application for a room online.
Private housing market
You can of course search on the private housing market for a furnished apartment/room or a place in shared accommodation (Wohngemeinschaft or “WG”).
Useful links for your housing search:
Important terms when you are looking for an apartment or room: