Do not stay at this hotel! Yes, it is cheap and it is indeed just across the street from the train station. And the trains stop running over night so that's not that bothersome after all. But you know what's also right next to the train station? The red light district - and in Brussels that means Amsterdam-style nekkid ladies in store-front windows and *very* sketchy characters on the sidewalks in front - right outside the hotel!! "The hotel is close to the city's vibrant nightlife...", hah!!
And even worse - the hotel is indeed non-smoking now, but they didn't exchange the carpets (or anything else) since a couple of decades ago - I had to figure out how to unscrew the inner windows to get air into the room in the middle of winter - it was that or just leave to another hotel in the middle of the night and just a few hours before going to the airport, the fumes creeping out of the carpet become too overpowering after a while.
And as a bonus gesture of ill will, when you sign up for wireless it is to be paid in cash at the front desk - and "there will be no refund if the signal is too weak in your room" (actual quote!), it doesn't work well on all floors and the only way to find out is to pay 10 Euros first. It actually worked kind of ok in my room but that was a small consolation. No idea where they got 3 stars from, 1 would be more appropriate (and, come to think about it, even in a 1 star hotel I expect to be able to breathe), everything else is false advertising. Yes, it is cheap, but how much are you willing to suffer for it?!