Hi
I flew to Spain a couple of years ago and ended up diverting into Valencia with high oil temp in my Tri-KIS. I put out a 'Pan' which confused the ATC controller but eventually he got the message and cleared me straight in. They had a 737 overshoot at about 5 miles finals to leave the runway clear for me and made all the other commercial traffic hold until I was safely on the ground. I was parked on the GA apron and stayed for a week until i had the snag fixed. Everyone was hugely freindly and helpful and from memory, it cost about 36 Euros.
If you don't mind a small drive, there's a private tarmac strip up the coast about 10 mins flying time away at Castellon. It's possible to hire a car in the town and drive into Valancia if you want to avoid the International Airport. There's a small restaurant at the airfield and better restaurants, hotels and a great beach within walking distance. The local pilots are very freindly and made me extremely welcome and even invited my wife and I to join them for Sunday Lunch (rabbit paella and baby octopus).
JJ