Early Booking Discount - Save Up to 15% OFF Derby Hotels. Take the advantage of early booking discounts at Derby Hotels, Barcelona. Book the apartments in Barcelona 15 days before your arrival and get the benefit of 15% discount. The promotion applies to: Aparthotel Allada. Aparthotel Aramunt. Aparthotel República. Apartments Gran de Gràcia Apartments. Milà Apartments. Val Apartments. Viladomat Apartments. Villarroel Apartments. Terms & Conditions: Offer valid for minimum 3 nights stay from November to March. Offer valid until 31 October 2016, will only apply for reservations done 25 days before arrival. Aparthotel República offers a 20% discount from November and December 2016.