No knowledge of the camperstop but if I could put in a word for those in the area next March. (Well, any March really.)
March 19th every year is the culmination of the Fallas Festival where the various districts of Valencia burn large models they have built themselves. Doesn't sound much but the models are on a gigantic scale and are remarkable in their composition. Add to that the Spanish ability to have a good fiesta and it can be seen, it's a place worth being at in March.
Looks a good site but maybe lacking in shade until trees mature.
Bear in mind that Valencia is a minimum 30ºC in July/August in the shade and 25ºC at night! But definitely a good stop in Spring, Autumn & Winter.
Stayed there in March and it is excellent. I take the point that until the trees mature it might be a little hot for some but in our case ......... send it on! It is a little more expensive than some other Aires but you get what you pay for, with everything brand new and spotless, REALLY helpful staff and very handy for catching the Metro into Valencia (400 metres)
The bar on site cooks traditional Valencia paella each night although we asked them to leave out the rabbit and it was delicious. A bottle of wine is included so RESULT!
I would recommend this to anyone.