The shown map location is wrong. As said by MGFlife, it is located inside the La Cantina. Beware the opening hours. It is open on Thursdays! And if it is not open, you still can buy anything, but pay in cash in the La Cantina. You can buy something in the bakery corner and then eat it (with a coffee or so) in the La Cantina.
— Yes, the establishment is dedicated gluten-free
— Excellent