I can recommend: Plumbing, electrical
Highly, highly recommended- José Giosa and his team at Hydro2Grup Gandia. They've just finished the renovation of our bathroom and kitchen and completely rewired and replumbed our place. Work completed to a really high standard, using quality materials (our tiles are beautiful), quickly and we hardly had to clean up! And really fair prices, given the quality.
You'll need to speak some Spanish, though-!