A private guide means you will receive undivided attention from your tour guide and you will be able to ask numerous questions and customize your Machupicchu itinerary according to your interests. Machupicchu is very big and you cannot see it all in one day, so having a private guide means you will see more and also see the attractions you are most interested in as long as it is covered within the 2.5hr tour. Plus, your guide is more than happy to snap photographs of you and your party throughout the experience.