It is a lovely route.
I complete the route in February which is not when I would go, due to the wide closer of the hostels, but that is an event for February only as I learned after I was on the road.
I used both the Sandy Brown book: T
he Way of St. Frances with GPS tracks, loaded on my GPS, and Angela Maria Seracchioli book: On the road with Saint Francis (
link)(this is the new copy in English) in my map holder, they didn't have a same route but I was able to read about differences on the routes and picked the one best for me, the two routes intercepted about every 10km when they separated. I also picked up a set of maps to for the last section to Rome that were great, I will pull them out tomorrow. to find a link for them. I didn't use the hostels but had no problems in finding rooms day of, with bookings.com. Lots of farm roads and paved road.
Please note that I went by bicycle not walking expect for the deep mud pushing.