Let me know if anyone has a guide you would recommend for Rome and Florence. There will be 4 in the party 2 adults 2 teenagers in June
A good start would be to browse the forum history for answers to similar questions. From the past two years:
Rome:
https://search.ricksteves.com/?button=&date_range=2y&filter=Travel+Forum&query=Guides+in+Rome&utf8=✓
Florence:
https://search.ricksteves.com/?button=&date_range=2y&filter=Travel+Forum&query=Guides+in+Florence
In addition, there can be advantages to tours provided by some attractions themselves.
Editing to add: looking back at some of your previous posts, you've mentioned a spouse with mobility limitations so you'd been interested in guides with a car. If this is still the case, versus a guide whose tours are largely on foot, it might be helpful to confirm for other posters?