You may think you’ve come to the wrong address when you arrive at what appears to be a storefront in Eixample. This modest museum’s small collection of decorative arts includes several pieces of furniture designed by Gaudí in collaboration with Josep Maria Jujol. The building itself, an adapted Modernista warehouse, was designed by Enric Sagnier and built between 1902 to 1904, but not much of that remains visible. A few treasures here include marbles by Eusebi Arnau, who did some major sculptures for the over-the-top proscenium of the Palau de la Música Catalana. Mostly the museum feels like a less-than-professional showcase for a spotty private collection.