Start with high-confidence italy travel books, then narrow by subgenre or adjacent topics.
DK Rome
DK Travel, D.K. Eyewitness Travel
My Roman History
Alizah Holstein
Rick Steves' European Christmas
Rick Steves, Valerie Griffith
The History of Rome in 12 Buildings
Phillip Barlag
Il Dolce Far Niente
Lucy Laucht
Lonely Planet Experience Rome 2 2nd Ed.
Duncan Garwood, Elisa Colarossi
The Shortest History of Italy
Ross King