AC Hotel by Marriott Denver Downtown offers European style, a buzzing lobby and rooms with custom details, complimentary WiFi and unforgettable views. Experience 54thirty Denver’s highest rooftop bar in the city at our hotel in downtown Denver, Colorado. Enjoy our chic urban atmosphere and our perfect location downtown near 16th street mall, Larimer square, Arts District and several restaurants and shops. Stay Confident cleaning measures follow CDC guidelines & all rooms receive a 2nd disinfection & inspection.