In May this year the albergue at Embalse Alcantara was closed, this made the section between Cacares - Canaveral a little difficult. Next year ???
In the event there was accomodation at Alcantara Pesca 927 090 510. (located just at the junction of the main road and the track down to the albergue) I opted to put in a short day Cacares -Casar de Cacares 12 kms, then next day Casar - Canaveral 36 kms.
Have you checked.....Mundicamino and Eroski Camino for Vdlp guides?
Regards.
George