Pierre Touitou, the 24-year-old chef behind charming Parisian bistro Vivant, is just the type of floppy-haired man-about-town that you might hope would show you his city.

“The weekend is about love, rest and parties… and you never know what will be the priority,” he says, without clarifying further. After closing up at his lively 25-seat restaurant, where he can be found conjuring up simple plates of Sardinian pasta behind the bar’s marble counter, Pierre heads a few doors down to Hôtel Bourbon, a club that prides itself on being the stomping ground of the city’s bright young things. The following day, lunch at seafood restaurant Clamato dusts away cocktail-induced cobwebs, after which Pierre heads to Champ Libre, his favorite flower shop, to prepare for the week ahead. “I ...