The Piedmont was discussed in another thread; you may find useful info.
About lodging: there are not so many options as in the Camino Frances.
Caution: many lists available in internet (and books) are not updated. And most of the places, currently, are not "donativo" anymore (they used to be, apparently)
My picks: Betharram, at the monastery (the entry is not obvious, it is a narrow passage just facing the old stone bridge). Roomy, comfortable. You may join the community in the nightly Mass. The adjacent church is very worth a visit. Arudy (one of my best experiences in my Caminos), parochial presbytery, rue Baulong 2, last round point before the church. Oloron Sainte Marie: Relais du Bastet (attention, many guides don't have the phone or the persons in charge right, it is currently managed by an association); try this. It is a medium city, there are many options and services. Leaving is a bit complicated, and there is also other (and more favoured) route going to Somport; in the "Relais" the hospitaleros give you a map. If you are not sure, ask for the cathedral, and then follow the signposts. Hôpital Saint Blaise, public. It is a minuscule village. Monreal. Gîte municipal, 7 rue des Frères Barenne. Ask in the Tourism bureau or the city hall, main square. It is a little city; also some hostals and hotels. Saint Just Ibarre, I stayed at a farm-albergue of Family Etcheberry, 1 km before the village. It does not appear in guides. I discovered this wonderful and warm place because of a sign in the panel of albergue municipal of Monreal.
Also, there other albergues in the village proper. Saint Jean Pied de Port. Lots of options, as you know. I stayed in the parochial, the "Accueil Kaserna". Good feeling.
Buen Piedmont Camino!