If this doesn't look like a very glamorous, luxurious, fashionable or suave hotel, don't worry, it isn't. It's just an inexpensive place to sleep and have breakfast, not far from the main train station.
I found and booked this hotel through Hotel Reservation Service (HRS) at www.hrs.de and paid EUR 44 per night for a single room (with my own bathroom, of course; that's "en suite" to you) including breakfast.
51°27'24.99" North; 7° 0'25.43" East.
Metropolradruhr bike station 7501 (Berliner Platz).
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