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Unless you like to sleep in a locked building until after 8:00 AM., with no running water between 10PM and 8:00 AM, I would avoid the Parochial Albergue in Acebo. Not my finest hours!
Moderator comment - Be aware that the views expressed here are personal and one person's worst place to stay...
The pilgrim office in St Jean Pied de Port also will provide you with a very detailed list of all albergues and other accommodation in each town, It includes the services for each town and the number of beds. It is invaluable and is up to date as I used it when walking in September.
I did not stay in Orisson so cannot help you there. However, since you are going in October it might not be necessary to have a reservation. There are lots of beds there. With respect to starting right away, I flew from Canada, (over two days travel) and made the mistake of starting my Camino...
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