Visited in the days after the Cannnonisations and was a lovely experience. There are so many museums and things to see that it cant all be done in one day. We opted for the tours which included The Sistine Chapel, St. Peters Basillica, Raphaels Rooms, gallery of the geographical maps, Raphaels rooms and more. It was great to be guided through these galleries but DO make sure you get a properly working headset or it does spoil the tour. It gets VERY crowded and with visitors from all over the world (including several countries where aparently good manners are punnishable by death lol!) It can be quite frustrating so bring water to drink in hot weather and stay patient. DRESS CODE can also ruin the trip for some people so do make sure you have your knees and shoulders covered. Hair can be ledt uncovered though. BEING PREPARED is a huge help and I would recommend pre-booking your entrance ticket (including queue jump) as there are thousands of people queueing for upto 4/5 hours on a daily basis.