The Musée des Arts décoratifs fills a restored wing of the Louvre with furniture, interiors, fashion, glass, ceramics, jewellery, and design. It is one of the best places in Paris to see French taste as something lived with, not just painted on a canvas.
The period rooms are the highlight, moving from aristocratic interiors to modern design. It is a strong choice if you have already seen the Louvre's headline galleries and want a quieter museum with real depth.