I highly recommend Maurilio's B&B. He is very welcoming and the location is super. I stayed about a week, and rarely took the bus or metro, but instead walked easily from this location! Trastevere is a pretty hip location, with tons of small restaurants and bars, and even the Romans come here for dinner. Don't worry about sharing the apartment with others. Your door will have a lock and you will keep your privacy! Thanks a lot Maurilio for having me.