We came to eat a pizza in the renowned GUI and left not fully satisfied. Starting from the environment, there are areas in the room that are dark, in which you cannot see what you are eating. As for the service, we found people who were cheerful and polite but not very attentive: I am gluten intolerant and I was given an entree, without explaining what it was or specifying whether or not I could eat it (and if I had eaten it?). We also encountered some pressure regarding clearing the table.
The gluten-free pizza was good in terms of taste (more similar to focaccia perhaps), but practically absent tomato, which instead was included in the selected type. The other pizza however was very good.
The price, honest all things considered.
I don't know if I would go back.