Family & Friends Offer by Derby Hotels Spain Save 25% Off at Aparthotel Arai Barcelona. Visit Aparthotel Arai Barcelona Spain together with your friends or family and book your stay for at least 2 nights in one of the Family Apartments grants and receive 25% off discount. Offer valid for March, November and December month stays only. Terms & Conditions: Offer valid till 31 December 2016. Book Now.