Definitely, I was sent abroad from 14 (to stay with families who were friends of friends of friends of friends who happened to have a Dd my age - this seems much safer!) it did wonders for my confidence.
With regards to safeguarding Spain is much the same as the uk, there is a similar process to CRB checking and actually children are really well cared for in Spain.
Plus in terms of language learning, immersion is the best way by far.