Ciao @Matt55eo
I am in Italy on holiday just now in Liguria.
I am using the trains.
Air bnb will sometimes not let you post a web link, for whatever reason they have!
Therefore for Italian travel suggest to your guests they down load the free app Treni EU.
It gives the train times, so guests can choose and take responsibility for their own travel arrangements.
Plus the ticket is downloaded as a pdf so you can show the controllore on the train, your screen shot or paper ticket, without having to stamp this train ticket prior to boarding the train, which leaves many unsuspecting tourists with a hefty fine, despite having a train ticket.