Tourism is one of Italy’s major industries, well-regulated by its authorities.  Beware of unqualified guides who can ruin your precious time here.
Remember, not just any tour guide will do.  Tour guides must be certified via Italian statutes, must take special courses of study to pass rigorous examinations.

Laila’s credentials in this area are impressive:
Certified Tour Guide Rome N. 0124
Certified Tour Conductor N. 0336
Certified Technical Director
Certified Vatican City Tour Guide
Member National Tour Guide Association S.N.G.T. F.I.S.C.A.T.