I agree with the view that one should also consider doing their training in the country they'd be flying. Weather puts off too many prospective students who tend to look at Spain and the US. The weather for flying could be restrictive even in Spain. There are factors that new students don't know or consider, e.g. wind, cloud ceiling, aircrafts' condition etc.
FIS seems to have good reputation. I'd only suggest to book your calendar only a few days in advance when you have some idea about the weather.
If possible, take all your exams before you start flying. It is not relaxing when you need to go home to the books after 2-3 hours flying.