I hope the authors don't mind my sharing this with the RS forum --
Loyola Univ. has a program in Rome that grew out of a handful of their alumni who served in the US detachments stationed there during WWII, and the guide that they give current students is a treasure-trove of information, from a fascinating perspective, on the city.
I came upon this publication when looking further into resistance groups that were active in major and not-so-major cities.