This tour covered 4 of Kathmandu's main attractions: Boudhanath Stupa, Pashupatinath, Swayambhunath, and Kathmandu Durbar Square. All these sites have rich histories, which I only learned because of my excellent guide. The guide was very friendly, knowledgeable, and steered the information he shared based on my interest and lines of questioning.
Since this was a new tour offering for Viator, it shoukd be expected that there would be opportunities for improvement. For Viator, make sure that you have a clear agreement with the local provider as to what is included. The price of the tour should have included lunch but I ended up paying for it. Unfortunately, that decreased my intended tip for the guide and driver. I can't take the local currency out of Nepal so I only exchanged a very exact amount of money. For the local provider, please advise your guides not to put customers in a situation where they are being solicited to purchase anything. Arriving Nepal, I was worried about kids begging in the streets but as it turned out, it was the vendors I met through the tour that I had to worry about.
Overall, this is a tour well worth taking. I would have rated this tour with 5 stars if not for those 2 issues I noted above.