I'm just back from walking the Francigena. Landed in Bergamo, made my way by train to Parma and then to Pontremoli (on the back of spouse's motorbike) and then by foot to Rome. Thoroughly enjoyed it. It was more expensive than I'm used to, but that was partly because we were staying in non-dormitory rooms in private accommodation.
Unfortunately
the guide books I'd purchased went astray in my spouse's lost luggage, and I was reliant on the Via Francigena organisation
website. And their app, that I'd downloaded. You get access to the interactive map that uses real time location. Which is great for pathfinding, but not so good if you are trying to work out accommodation (as it lists the accommodation based on distance, both south and north, from your current location). Once I was reunited with my guide books I realised how useful they would have been.
The website for booking
convent/monastery accommodation is very useful.