Lille's got that perfect underrated charm—think grand Flemish architecture without the Paris crowds. I spent a weekend there last year and wandered the Vieux-Lille district, grabbing moules-frites at local brasseries. For a solid overview, check out this handy guide that covers hidden gems and practical stuff like transport: https://lille.french.guide/en/. It's got maps and itineraries that saved me time. Pro tip: Hit the Sunday markets for fresh waffles and hit up Roubaix for street art if you're into that. Definitely worth the train from Brussels—affordable and quick. What's your must-do in the area?