We just got back from a 10 day trip to Rome, Florence and venice. We used Rick's guidebooks and his pointers and books are absolutely amazing. Rick however does not mention that in January you have no crowds, no lines and no heat to deal with. It was 50 to 60 degrees most days and with a good jacket there was no problem. I don't know why he doesn't recommend to travel in the winter. I would have hated the summer with the heat and the long lines go to everything and the crowds. We had none of that. The cafes and restaurants still set up shop outside with heaters so there is really no problem traveling in the winter. Yes it gets dark earlier and it rained a little here and there but it was no issue. We went to Paris in the summer and it poured all 4 days we were there! We were freezing cold.
I wanted to post this because I could not find anything about travelling I the winter.
Go ahead and do it, we had a fantastic time!
One more thing. 'The Raffello' hotel in Rome was fantastic ! Great central location and fantastic small cozy hotel. The hotel 'Residencia del Proconsole' in Florence however was not so good. The bed frame was loose so every movement was heard. We asked the guy to fix it. It really needed only a screwdriver, he didn't bother. There is noise all night from within the hotel as well. Mariano's answer to everything was, this is how it is. The Hotel in Venice 'Locanda al Leon' was centrally located but we were on the 3rd floor with no elevator. No problem for us but I just wanted to mention it. This hotel was like an apartment with kitchen and living room and 2 terraces. If you ask me, I don't need any of that. We just go to the room to d sleep!
So in conclusion, go to Italy in the winter! Hotels are cheaper, airline is cheaper, no crowds, no lines, no heat and you will have a fantastic time!
Oh yes, and we saw the Pope in a church right next to our hotel. We were there by accident. It was a surprise visit from the Pope and for us :)
Happy travels!