I walked from Santaren to Porto in late Oct and even out of season there were people on the route. There is a good hostel 2300 Tomar in the centre of town. Alvaiazere: Albergaria Pinheiro - small one, rooms for 2 people or private ones, stamps to rememer
Rabacal: go to the private one, at Cafe Bonito, brand new, have a swimming pool. Coimbra: Rainha Santa Isabel, before crossing the river to the city, huge, old and atmospheric. Mealhada: Alb Hilario, check if they have hot water in the dormitories, we didn't but the ones staying in private rooms did. Agueda: probably the best albergue on the Portuguese way, Alb St Antonio. Slightly out of town but worth it, still on the way for next day. Albergaria: we went to A-Nova - avoid as almost on the highway, very dusty and polluted. Stay in A-Velha instead, greener and more pleasant town. Sao Joao da Madeira: we stayed in Casa da Misericordia, donation, not exactly an albergue, huge room, mattresses on the floor. Hope that helps.
Anna