Efforts are on to maintain a global standard with the World Tourism Organization (WTO) and the International Organization for Standardization (ISO) taking the initiative in this regard.
The main factors that are considered before assigning a Five Star grade to a hotel are first and foremost food and service followed by the quality of accommodation and the variety of amenities on offer. Other factors include the location and setting of the hotel, the views that it offers and of course the ambiance.
Five Star hotels offer all the above along with extra services like extra large rooms, exquisite food and drink, fine service (24 hours) and in room facilities all go a long way in determining whether a hotel deserves a Five Star rating or not. A number of London hotels (51 to be exact) are graded as Five Star and offer the very best in luxury.