In Rome as I write this, and while I don't have firsthand experience with Walks of Italy, we used Private Tours of Rome for three tours so far this week and one more to come tomorrow. I can recommend them highly. Our tour guide is Massimiliano, with a background in History and Theology, and on Monday he took us through the Vatican Museums, the Sistine Chapel and St Peters Basilica -- I can truthfully say that he made the experience come to life for us. My point ... if your time is limited and you want to get the greatest experience for the time you have available, a tour with a knowledgeable guide will make ALL the difference!