Can someone recommend some good tour groups or guides that take a visitor to both sites, please?
Rick Steves free audio guides -- you can download from this site to your phone.
Steves' Rome book has a number of recommendations. I much prefer a live guide or a recording or a book. We have used Angel tours in Rome.
I used Walks of Italy and was very happy with them.
Dark Rome is also a reputable tour guide company.
I used Rick Steves' audio guide for the Roman Forum and got a tour guide when I ordered my tickets online at Coopculture.it.
Sonia Tavoletta ([email protected]) is excellent. She is a colleague of Francesca Caruso. Does a marvlous job, only your group so very private and efficient moving through the site.
I used Dino after finding out Francesca and Sonia were booked on our last trip in September. Dino was great and i'd use him again around Rome. http://afriendinrome.it/?project=dino