Km1 Costanilla Apartments Welcome to the 1x000D star rated Km1 Costanilla Apartments in Madrid. Dining is available at the hotel, which has it's own restaurant. Room Features Km1 Costanilla Apartments. Smoking in certain bedrooms is allowed, as well as in public areas of the hotel. Please specify when making your booking. All rooms have tea and coffee making facilities. Other Info. An airport shuttle service is available from the hotel. Pets are most welcome at the hotel. Hotel guests can make use of the concierge service that is provided.