Cotton House Hotel Barcelona ★★★★★ 5 star. Part of Marriot Autograph Collection. New luxury boutique hotel in downtown Barcelona just 5 minutes walk from central square Plaza Catalunya. The Barcelona Cotton House Hotel has elegant luxury rooms with free WiFi, a small seasonal rooftop pool and an inhouse restaurant. The name is derived from the 19th modernist building which was headquarters of Cotton Manufacturers Association, The interior is magnificent with a beautiful vestibule, a conservatory, several lounges and a library. Rooftop pool, gym and a massage room. Rooms are air-conditioned rooms with flat-screen TVs and sofa.