Just got home today off Wonder and some of the information in this thread was invaluable. Due to the taxi drivers strike on Thursday we had to walk from the Vatican to Spanish Steps. Only took 25 minutes walk but had to stop at H&M for new sandals for daughter as her feet were killing her. There was also a mass police presence due to, what we were told, a taxi driver protest including flares been let off. Also the Italian prime minister decided to resign that day meaning the media were out in force and streets were blocked off.
We did, however, still manage to visit the Vatican, Spanish steps, Trevi fountain, Pantheon and Piazza Navone.
A big thanks to @euro cruiser with the bus info. Not fancying a 30 minute walk back to San Pietro from Piazza Navone, and with no taxis available I looked up this thread to see what bus we could get and where from. With the help of Google maps I easily found the bus stop and jumped the 64 back to S. Pietro with 45 minutes to spare before getting the Civitavecchia Express back.
So thanks again everyone it helped us to have a good day plus I also got some brownie points off the family 👍🏻😀