According to a Yelp review the management here changed recently, so if that is true I may have had a different experience than previous reviewers. This is a review based on 1/7/2018. I called to order pickup, and the person on the phone checked with the kitchen and said that though their gluten-free pizzas are safe, the sauce has a potential for cross-contamination because the ladle has touched flour pizzas. A little weird, but not too big of a deal to order without sauce, so I did that. We got there and the pizza had been made with sauce. They apologized and remade it, though it took a while to communicate what was going on since the main person at the counter was new and a bit confused (it happens). The pizza was pretty good; the crust was something similar to Udi's I think, but with some kind of herb blend infused for flavor. I don't think I had a reaction, though I can handle a very small amount of CC. This still seems like a good place, and I appreciated their honesty, but make sure you ask questions and convey to the kitchen to take extra precautions if you are sensitive, and I'm not totally sure about celiac.
I have Celiac disease. This is one of the few places I can order pizza and trust that it will taste great AND I won't have a reaction. The gluten free crust is actually quite good, and there a lot of options to choose from as far as toppings go. We get delivery all the time and have always had a very pleasant, delicious experience with Pizz'a Chicago in Sunnyvale. They even have gluten free desserts, which are just as delicious and safe as their pizza!