We just completed a two week tour organized by Kuoda. We combined the Galapagos Islands with our tour of Peru, so Kuoda coordinated with Klein Tours in Ecuador for that portion of the trip. From the moment we met our first guide in Quito, to the day of our farewell at the Lima airport, all four of us felt that our trip was phenomenal because of Kuoda. We really did not have to worry about anything, as virtually every detail was well thought out and executed. (There was just one snag when no one greeted us at the Quito airport for our international flight to Lima, but all we had to do was walk to the international terminal, as we had our flight numbers with us.)
Our schedule in the Sacred Valley allowed for all of us to acclimate to the altitude, so altitude sickness was not a problem for anyone.
We had incredible experiences with the local Peruvians in the Sacred Valley that we never would have had on our own. The restaurants they took us to allowed us to experience Peruvian cuisine at its best! All of our questions were answered thoroughly and with patience by knowledgeable guides. And when one of our group needed medical attention (unrelated to the travel), our guide made the appointment, took him at the appointed time, and translated when necessary. Without reservation I would recommend Mery and Kuoda to anyone considering travel to Peru.