I remember reading a blog about a language assistant in Galicia, Santiago specifically, and she posted about how to find private classes and how much to charge. It's on wordpress and is called The Purple Backpack.
Thank you! This is really helpful. It sounds like things are difficult in Galicia right now, but the demand for native speakers is still booming. You can do well if you're willing to put in the effort of self-promoting. This is what she had to say:
the Spanish demand for native teachers is HIGH. What does that mean in terms of euros? Well, if you want to charge 20€/hour as a basic rate, you’re not going to find many takers. The average rate is 10-15€/hour, depending on the type of lesson. Child classes are offered at a cheaper rate 10€ for kids and 12€ for adults, because it requires less planning. What's better, you can also offer group classes. Grouping means that rates automatically increase with minimal extra effort. It is also an incentive for the parents, as per-student prices actually decrease the larger the group is.
For example: one child is 10€/hour. But 2 kids are 15€ and 3 are 20€.
Brilliant! Thanks again!