AlphaSix
Why would you pick a flight school that you know has problems? And, yes, Spanish is the spoken language at LEAX.
As always, go and visit the school. Ask to sit in on a theory class. Speak to students on the ground to find out the current situation.
As for location, that would be the least of my worries. Spain does have public transport and you can get from Malaga to Jerez Airport fairly easily and from Seville Airport to Jerez very easily. Though you're right the price is hefty.