We have booked a tour for less than a day in advance, and ended up receiving top quality experience, very well prepared and tailored to our needs. The timings were well planned, there was no pressure in case we took our time somewhere. Tour guide, whose name was Leo (or Viet), was very accommodating and flexible, he was helping us out with very little details – paying when we didn’t have cash, giving recommendations and honest advises, he was very knowledgeable, was able to answer every question and told us very interesting stories, with a great sense of humour. With him, 10 hours of the tour went very quick and easy.