Ferdinando. This is key, to the best of my knowledge, to an amazing experience. I booked this tour via airBnB - a first for me - and all of my uncertainty was quickly washed away. I took a tour with Ferdinando of the Colosseum and Palatine Hill, it turned out to be just the two of us. His English was great, but beyond that he was an archeologist who had worked on the grounds that we were touring, so it was an incredibly personal tour with lots of specialized knowledge. I honestly think this is the best tour of any tour that I have ever taken, anywhere in the world. His knowledge was specific, it was historical and geological, as well as architectural. I asked loads of questions (because I enjoy history/architecture/geology/disasters) and he was totally ready for any and everything I threw at him. He offered me a tour of the Vatican the next morning, which I’d already booked another, and I decided to stay with my previously booked tour. WHAT A MISTAKE! I would have MUCH rather gone with him, a two person tour it would’ve been, instead of the near 80 people that I joined. We could have had an incredible tour, instead I got bland and basic. If you’ve the opportunity to tour with Ferdinando, god willing, TAKE IT!