I’d be very careful on hotels around the Gare du Nord. Many of the cheaper ones are little better than knocking shops. (The red light district is behind the station). The Tulip Inn and the Crowne Plaza are legit but pricey. Also there is nothing much to do around this area at night except look at the drunks and drug addicts in Place Rogier. This is not the safest place in Brussels after dark. See: