We were lucky to find this small tour company through our rental apartment owner in Rome. We asked her to recommend some travel companies and she brought us right to them, although they were in walking distance of our apartment and the Vatican, we would have wandered aimlessly on our own! Quo Vadis takes small groups, both days we were about 6-8 people in total. Our guide, Guilio, was an archaeologist and he really knew his stuff! At the Vatican, he told us it would take 3 months to see everything, therefore he selected his choice of highlights, explaining the history, time sequences, and lots of little tidbits which made it so interesting. Actually, without this tour, it would have taken us 4 hours to get into the Vatican. As it was, we just walked in. Interesting tidbit, the Pope loves to speak to the people, and when he chooses to do so, the Vatican is shut down! Our tour operator was lamenting about this, and sure enough, he was speaking the morning we wanted to go, but she knew and booked for later in the day. We did wander over and take a look at him and the throngs of people. It was something to see, very moving, even for a non-Catholic like me!
Luckily, when we were heading back the next day for the Coliseum tour, we ran into Guilio as we were taking a wrong turn, and we were fortunate to have him as our guide at the Coliseum as well. Once the tour was over, Guilio was willing to spend more time showing us other local sights, with no pressure and no charge. Just a decent young man, unfortunately, we were all too exhausted to take advantage of this! Quo Vadis also provided us with transportation to the airport when our vacation was over. I would highly recommend them, and their prices were excellent as well.