Valencia must me the worst airport for GA in Spain.
First, check, if they have mandatory slot times for your arrival. They have a tendency to think of themselves as something much, much bigger and institute slots for events in the area. Check the NOTAMS well back, this is sometimes buried in a months-old one.
Second, you will be forced to park at the far end of the airfield. This also means, that you will be forced to use handling (Servisair or others) for the transfer to the terminal. Last time I was there, EUR 50, but I have already paid much more during some sort of event.
The fuel station is right next to the ARO - but don't even dream of parking on the huge apron in front of it while you file your flight plan.
Landing and parking fees are low, as per AENA schedule.
You have been warned......