Some things are certainly cheaper! Red wine at €0.90 per litre, brandy & whisky €7.00 a bottle upwards.
English might be the lingua franca of aircrew but not maintenance, unless you work in somewhere like Holland or Scandinavia. Fortunately most of the guys I work with in Andalucia can speak some English (two perfectly) and I'm slowly improving my Spanish but many aviation companies won't have mixed nationality groundcrew so you'd really need to learn the language to be in with a chance, imo.