Very expensive, but very cool: The Mandarin Oriental Hotel in Barcelona. Designed by Spanish Architect Patricia Urquiola, responsible for the interior decor of the 98-room hotel, including most of the furnishings. This 5 star luxury boutique hotel takes care of you in sunny Barcelona, with a inner and outside pool, rooftop terrace and infinity rooftop-pool, splendid rooms, restaurant etc.. so splurge if you can..

More info mandarinoriental.com