Extend Your Stay With Up To 25% Discount Barceló Monasterio, Boltaña. Special Offer 3 or more nights, up to 25% discount. Now extending your stay has rewards. Stay for longer and get bigger discounts. T&C: Valid for Barceló Monasterio de Boltaña. Offer valid until 31/12/2015 Except from 01/06/2015 to 30/09/2015. Minimum stay 3 days. Book Now.