Here's a sweet little excerpt on the island from about.com...
Lots of tourists swarm the island in Paris, home of Notre Dame Cathedral. But far too many overlook its adorable little sister, the quaint Ile Saint Louis just a few steps away.This small island is like an oasis from the rush of the city. It's almost as if someone dropped a small French village into the center of Paris, as it features markets, bakeries, fromageries and cafés. While much of Paris has modernized over the years, the ile remains romantically frozen in the 17th century. It is remarkably the same as it was centuries ago.
Paris Neighborhoods: Ile Saint Louis,
A Charming Oasis in the Heart of the City
From Kelby Carr