At first, we weren’t sure we would try to navigate the bus system even with my ability to mostly communicate. We are so glad we tried it and it was so good for seeing other parts of the city. The main tourist attractions were walkable from Trastevere but there is plenty to see that is a long walk away. Bus tickets are 1.50€ per ride but we got the 7 day pass so we could ride as often as we wanted during that week. You purchase your bus tickets at the Tabbachhi store (they always have a sign with a big capital T out front). If you buy a paper ticket, towards the back of the bus you will see the machine to stamp it. The bus stops are easy to find on Google maps or just by their large signage on the street. You want to note the stop you get on (for your return trip) then find your destination under the bus number. Google maps is very helpful as it lists the bus number you need for your trip. The system might not be as efficient as an American would expect but it saves your feet and will get you where you need to go. Taxis are also super easy and every one we used accepted credit card but preferred cash. Taxis are always white in Rome.