Mario was our guide and he was amazing. Not only he was very knowledgeable, but he was also funny and had a loud voice. This was particularly important because the day of our tour it was very very windy. For us this tour was very important because even if we had walked around the city during previous days, we realized we missed many details. And Mario pointed out some "must seen" places that we were happy to explore after the tour. Definitely a very good experience.