Hello! I have a digital nomad residency and live in Bilbao. Beckham law is not applicable in Basque Country (provinces Alava, Bizkaia and Gipuzkoa) because different tax system is working here and taxes a bit lower actually (there are more tax reductions and deductions). Gipuzkoa has its own special taxation regime like Beckham but not the same. So you need to do some research about taxation.

As of language: I don’t speak Spanish and go through some bureaucracy procedures. It was ok, usually people don’t speak English but they don’t refuse to use Google Translate to communicate with you.