I used this Bugaderia D'Autoservei yesterday in Tortosa. There are two large  capacity washing machines and one large dryer. My kingsize duvet fit  easily. Cost 7euros (take coins)  It is run by a Brazilian lady who is very kind and helpful.
She also does clothing repairs.
Prices are displayed inside and after 5 uses the 6th one is free. Hours 8 til 8.Monday to Saturday. Address is
Passeig Joan Moreira No 3 P-BX1, Tortosa. Its opposite the old police station on the same street as Recanvis Blasco.
Well pleased.