I tried to do that, but it won’t let me select the name of bodies of water.

Yeah, it would only apply to people from outside the EU that also don’t reside in Spain.

Source (in spanish): https://www.eldiario.es/economia/ventajas-fiscales-alquiler-asequible-limites-extranjeros-no-residentes-sistema-publico-garantias-nuevas-medidas-vivienda-gobierno_1_11959199.html