Here's the instructions for sending a package to @ivar:
https://casaivar.com/luggage-storage-in-santiago-de-compostela/
There is a Correos office in Puente la Reina:
https://maps.app.goo.gl/jZmmB1HuPnguctRK6
This site is run by Ivar at in Santiago de Compostela.
This site participates in the Amazon Affiliate program, designed to provide a means for Ivar to earn fees by linking to Amazon