If Covid negative test requirements are still in place for Italy and the USA, make sure you preschedule your covid test with in the small window before you leave USA and before you leave Italy. We used Synlabs. It was about 5 miles out but easy. We had to wait one day for results. I'm sure there will be others opening as long as the USA continues to require negative tests to return.
You will have to be tested upon arrival in Italy. There was a long wait for both the testing and the results before we could leave the airport. At this time, Vaccines are not recognized and Italy requires negative test upon arrival at the airport. Even if you had a negative test 48 hours before leaving the USA. But Airport authorities who were at the airport on our arrival (being one of the first USA flights to arrive since Covid) said that Italy will have another line for vaccinated passengers and won't require covid testing in Italy.
United Airlines did the best they could to keep us informed before the flight but paperwork was still confusing. You will need:
1. Neg covid test to board flight from USA to Italy (United)
2. Covid tested upon arrival by FCO Airport and need a negative test to leave the airport. Expect about an hour or 2 to get out of the airport as more and more tourists start traveling. (schedule online before you leave)
3. A filled out EU Digital Passenger Locator Form (dPLF) printed out after registering online
4. A SELF-DECLARATION FORM FOR TRAVEL TO ITALY FROM ABROAD
5. A negative covid test 48 hours before you leave Italy to get back in USA
Be sure to check the countries that are still not allowed in by both Italy and USA