a business stay anchored on the European Quarter, a culturally led visit built around the Grand-Place and Sablon, an Art Nouveau-minded stay in Ixelles-Saint-Gilles, or a quieter stay slightly further out can each justify a different shape of day. The point is not to fill every hour, but to give the central experience an honest approach and exit.
Once one district, reservation or hosted moment is allowed to anchor the day, the city has room to be encountered rather than merely crossed.