Mum and dad in law have a place in Spain that they are trying to sell too. They have rented it out before and ended up with a couple of problems.
Rent and renew on 11 months or less. If it goes over 11 months, the tenant can stay in for upto 5 years before you can get them out (spanish law) and if they don’t pay the bills you’re stuck. We had this and bang at the end of 5 years he left. House was a crap hole and took some time to put right. He was spanish so knew how to play the rules.
Then rented to an english family who left after 6 months. Couple of problems but think they were suss.
Depending on where it is try holiday let, 1 – 2 week or try selling.
The market is picking up and houses are selling. Our house is on with an english man who looks after rented houses and sells them too, not a spanish agent. He’s shifted a few in the last couple of months without huge chunks being knocked off the asking price.
There are some UK solicitors that have offices in spain. You deal with the UK office and they deal with spain. Maybe cost a few quid more but worth it as they can’t just fob you off.