I was traveling through Saarlouis and spent 1 night at the Bahnhof hotel. The staff were very friendly and spoke great English and there was parking right outside the hotel free of charge.
However, the room (and entire hotel) is in dire need of renovation. Also, the location is not as central as you’d think – most restaurants and bars are on the opposite side of town (quite a pleasant 20-min walk through the park though).
All-in-all, an OK hotel which is just about worth the money.