This is my description of the CPI in English:
https://www.caminodesantiago.me/com...port-from-portugues-interior-june-2018.56758/
There is also an active FB group now for this Camino which might be of great help - when we walked it there was none and the organisation that was behind it had very limited resources and info available. Now it's much better.
Anyway, as we walked without any maps, apps, internet or gadgets and managed to find the way around it means it's rather walkable. Markings depend on the municipality, in some it's well marked in others less frequent. There were a couple of spots where we got lost but that was ok. Accommodation: we walked on a budget and tried to stay in the municipal albergues when available, so if your budget is more flexible then there are more options available. If only we called the municipalities at least 1 day in adavance informing we are coming tomorrow then I guess more of them could have been ready to host us in municapal albergues.
General impression: friendly people who always try to help you, not necessarity in the know about this Camino, little asphalt in comparison to other Caminos in Portugal, more nature, slightly different/colder as it is in the mountains. Actually expected much more strenious walk, but that wasnt bad, as the altitudes most of the way are between 500 and 1000m. Not a social walk, rather solitary as there may not be any more pilgrims at the same time till you cross over to Spain. Very beautiful nature, wish we had better weather to see it all! Nice towns on the way to explore as well, so a good mix there. Bom Caminho!