Having used the Spanish health care system for 25 years I can assure you that is is good. Nursing is often down to the family, that is, you have nurses to provide the care, but family are accepted with the patient as they take care of well being, watch the drips etc.
Some hospitals have two patients to a room, the Dr’s are very good, many speak English if it is a need. Ambulance service is provided in Valencia Community returning and collecting patients but expect some cut backs after regional elections. GP’s about the same as in the UK, you just may land on a bad one. I have seen a fantastic improvement over 25 years, lots of new hospitals and health centers, better qualified staff and improved equipment. Just make sure you are registered correctly as shown in the sites given and enjoy your time here.