I had the best time with this tour. I did all four walks and, as soon as I finished them, did them all over again! They are very accurate, entertaining, informative and fun. I also did the Trastevere walk by Frommer’s, not even close, avoid this one unless you have plenty of time and patience to figure out directions.
My wife and I, along with another couple, used this audiobook to tour Rome, and we also used the same series in Florence. We found it very informative and a great way to see sights we never would have seen on a mass tour. It provides interesting information and a little exercise after the Italian cooking. I highly recommend it.