Keystone House Kings Cross London. Keystone House Hostel is located in the heart of London, within two minutes walk from Kings Cross and St Pancras station. Its location is perfect for exploring all the sites and attractions of London including Big Ben, Covent Garden, The British Museum, Madame Tussauds, Buckingham Palace, the Tower of London, St Paul s Cathedral, Tate modern and many more. Included in your stay : FREE Wi Fi access in the common room. FREE Maps. FREE Bed Linen.