We used Artiva for walking tours in Rome, Florence, Venice. In general, excellent. We would certainly use them again. Far far better than the one non-Artviva tour we were forced to use.
Rome: walking tour with Cindy: this is a long and slightly rushed trek, from the Coliseum past (but not into) the Forum, up to the sites around the Trevi and Piazza Navona. It’s quite a long walk; in the height of the summer, I imagine it could be painful, requiring multiple gelato stops. If you want to see the Forum – which you do - you’ll have to schedule another half day on your own. It ends at a much-deserved wine bar.
(Suggestion for Artviva: split into two : one Colisseum/Forum; the other the rest).
Capuchin Museum and Crypt. Guide Peter handled this – very knowledgeable and an excellent tour.
Vatican Museum. This tour goes through the Vatican Museum to the Sistine Chapel and St Peters. Our guide was Simone. He knows his stuff; the problem is that there are at least ten times too many people in the Museum, and it’s rushed, so you don’t get time to stop and look, and if you could, you’d be trampled by the mobs. Still, you do see the Sistine Chapel for a decent amount of time, and how could you go to Rome and not see this? We barely saw the Pieta over the heads of the millions. Simone left us in St Peters; you likely could stay for many hours more, except you’ll be hungry by then, and it’s not clear you can get back in if you leave. Under the crowded circumstances, this is about as good as you can do, I think.