Across the street from Green Park, this swanky hotel with a lush living wall is a 6-minute walk from the closest tube station and an 8-minute walk from Buckingham Palace. Chic rooms offer free Wi-Fi, flat-screens and iPod/iPhone docks, along with Nespresso machines. Upgraded rooms add balconies and/or park views. Suites have 4-poster beds and living areas; an upgraded 3-bedroom suite provides a whirlpool bath, and a balcony with sweeping city views. Apartments come with kitchens. Room service is available 24/7.