Hi! I just want to point a couple of things regarding the information posted by JamonGris (just to clarify and help).
1- AeroMadrid are not the only one in Cuatro Vientos airport (Madrid) to do their own maintenance or to have their own maintenance hangar. Aerofan does their own maintenance in their own hangar aswell.
2- I'm pretty sure that you can request to take all your exams in English. The ATPL exams are in English and Spanish at the same time (i.e. the paper is divided in 2 halfs the right hand side is in English and the left hand side is in Spanish) it doesn't matter if you are a modular or integrated student. To be honest there are FTO like AeroMadrid, Aerofan, etc where you can take the course in English.
If you need a full list of schools that do their own maintenance within Cuatro Vientos or FTO who runs English courses, PM me and I'll be happy to help.
Regards,
Bubble