Welcome to THS and to the forum. I can assure you that there are MANY many sitters that would jump at this opportunity! Especially in NZ, such a desirable location. We had a sit last year that was nearly a year long…you can read more here
I would be gutted too if I had to leave our dog for that long but rest assured I think you’ll be able to find some great options to care for your dog while you’re away in Spain. I would recommend getting your profile up ASAP and reading up on how to get it to attract sitters. Adding your profile URL here to your forum profile will also allow other members to offer advice on your listing.