Rick has a lot of nice recommendations on that page!
Two books he left out—perhaps because they take place in towns just outside of Rome—that I think are great reads are:
"An Irreverent Curiosity: In Search of the Church's Strangest Relic in Italy's Oddest Town," a nonfiction book that is part travelogue part history and part detective mystery about Calcata, a medieval hill town 35 miles north of Rome where there was a strange holy relic in the church—the foreskin of Jesus (I'm not joking)—that recently went missing under mysterious circumstances and the author, David Farley, tries to find out what happened to it. In the book, he also ends up hanging out a lot with the hippies and artists who live in the village.
"Pasquele's Nose: Idle Days in an Italian Town," is a travelogue where author Michael Rips moves to the town of Sutri (not far from Calcata, actually) with this wife and child to hang out with the many eccentric locals. It's a classic fish-out-of-water story, but in Italy.