Barcelona City Summer in Barcelona 10% OFF!! New promo code with an aditional 10% discount for Barcelo Sants Hotel, in Barcelona. You can use it also with other offers. T&C: Not valid to use with Happy Days, Happy Nights, Happy Weekend or for register users. Valid only for Barcelo Sants Hotel. Valid for bookings until 6 July 2014. Valid for stays during July and August 2014. Book Now.