Thank you all for your advice. They're all very helpful and goes to show the number of options that we have. We reserved a car service through Bob's Limousine and tours for $240. Company had very good reviews, including through TripAdvisor.
Thank you so much @euro cruiser and @CruiserBruce. The information you provided is most useful! I will reach out to your recommended companies shortly.
Travelling with a family of 7 (all adults) in August and looking for recommendations for airport transfer from Rome Fiumicino Airport to Civitavecchia cruise port. Saw Shared Shuttle (sharedshuttle.it) but it had very little reviews out there and they're mixed reviews. Any recommendations (this company or any other reliable and safe company)? or should we just hail a cab from the airport. Help please?