The level of acting of the actress doing the old woman's voice is REALLY good, the problem is that you can clearly also hear its an 40 year old actress trying to do an 80 year old voice.
The old man in spanish is freaking amazing, and so is the king, but thats becuase we spaniards usually love our charismatic "raspy" deep voices.
A funny anecdote, for example, is that americans dont usually like that type of voice it seems, becuase Disney Spain lended some of our best voice actors to make the spanish buzz voice, that you would consider "deep voice" (Ramon Langa the usual voice of Bruce Willis; Jose Luis Gil the actual spanish Buzz Lightyear voice; Constantino Romero, that was the voice of Dart Vader and Mufasa, may he RIP...), and everyone was rejected because Pixar said "they sounded too raspy, like they smoked 20 cigarretes a day". At the end they choose a mediocre voice actor that only does voices for children toys here, so not someone we really like in Spain.
Zelda voice is really good, but her cry was the worst part (without being bad of course).
I think my favuorite Zelda though is the Italian one, has the best voice (very similar to the spansih one actually) but her cry is just perfect.