5€ a load to wash and another 5€ to dry. They run about 41 and 35 minutes each respectively. You can pay with a credit card or euros in denominations of 5,10, or 20, anything higher is not accepted. WiFi wasn't working when I went but there is a cafe caddy corner that you can enjoy a beer with some tapas.
I gave it a 4/5 because 5€ for a load is a lot but several locals were also using it so it's probably an acceptable price here.
The directions on how to pay and use the machines are in Spanish but it's pretty easy. read more