Bochum has plenty of reasonably priced hotels.
The following two hotels are located close to the main train station from
which you can directly take the subway to the university campus.
The Wald und Golf Hotel Lottental is a 15 min walk away from the campus. It is situated in the scenic Lottental.
All hotels bookings are possible by either contacting the hotel directly or
using the web sites
www.hrs.de
www.hotel.de