We love going there too. We have some good books. Whenever we travel for business or for fun I will pick up one of the travel books by DK. One of our favorite books it the "Irreverent Guide to Rome"
. They have the same guides to other cities as well. One of our favorites in this book and the creepiest place we visited in Rome was the Crypt of the Capuchin Monks (sneak peak http://en.wikipedia.org/wiki/Capuchin_Crypt
). Florence is my wife absolute favorite place. Believe or not, she doesn't like Venice all that much. The tower of Pisa is open once again so you can climb it once again. There is so much, where to start!?