Our tour wasn't canceled but it was the worst tour ever. The guide wasn't giving a s***t about us. He was very rude from the beginning. He was walking too fast (which was a problem for the older people of the group, and even for us, he was hard to follow because of the many people around in the vatican). We weren't able to hear him properly and he didn' take the time to explain to all the group what we were supposed to do. We paid a substantial amount for this tour (178€ for 2) and it wasn't worth it (the audio guide must be cheaper and way better). When I tried complaining about our experience to Viator the didn't give a s***t either. I won't deal with them in the future and I'm making sure to let people know about their bad service.