The hotel had a great location, between Central station and the City hall square. Despite this, the room was quiet and decently equipped.
My main remark, was that I chose this hotel over another in the area, because Novotel offered "Fitness facilities". The gym turned out to be 10 square meters with ONE crosstrainer, ONE treadmill, ONE cable-based machine and ONE fitness ball. No free weights, or similar - and no windows. If more than one person is training at the same time, they will have to discuss a plan for when to switch around.
For the comfort and location, I would choose again. For the lack of a proper gym, I will stay clear of this next time I go to Brussels.