Discover The New IBEROSTAR Las Letras Gran Vía & Get a FREE Night Stay! New hotel IBEROSTAR Las Letras Gran Vía. And to celebrate our opening, we are offering all guests staying in our new hotel a free night stay in any of the IBEROSTAR Hotels & Resorts. Valid for bookings made until 28/02/2015 and hotel stays until 30/06/2015. Use promo code: IBSNIGHT.