We were looking for a gluten-free place to have a coffee and snack, and we found this one on the Celinews website.
It's a bakery/café that offers gluten-free options suitable for celiacs. It's located right in the city center and is also part of the Aragon Celiac Association.
They were very busy, and it took a while to accommodate us and serve us (but you can't reserve a table, so you arrive and they'll arrange your order).
The best part is that they allow you to order your own gluten-free cake.
Our slice of gluten-free Red Velvet cake cost €4.90.