I have been to Diego Vitagliano and the experience was really great. The place is very large, well-kept and above all very clean. You can immediately notice the attention to hygiene, not only in the rooms, but also on the part of the staff: the waiters were always available, attentive to cleanliness and also very friendly, which made the atmosphere even more pleasant.
A big plus is the vast gluten-free menu: the choice is really wide, both for appetizers and pizzas, and this is rare to find. I really appreciated that the gluten-free dishes arrived at the same time as the “normal” ones — a detail that really makes the difference, especially when you are in company.