Bookingsunnyholiday - Washington Mayfair Hotel Opened in 1913, Washington Mayfair Hotel is situated in London and offers valet parking, a coffee bar and 24-hour room service. It is close to Piccadilly, eateries and shops. This 4-star hotel offers a concierge, meeting rooms and a 24-hour reception. Wi-Fi is also provided. The rooms are air conditioned and include a mini bar, a coffee maker and a flat-screen TV. They all have an in-room safe, heating and a desk.