The tour to Humantay Lake Cusco from Ollantaytambo is possible after your stay in Machupicchu and you want to stay in Ollantaytambo so you can make the tour without the need to get to Cusco.
Although one of the requirements of this tour is to depart from Cusco towards the Humantay Lake in a shared service, the realization for you to take this tour is almost impossible due to the distance between the main road that goes to Humantay and Ollantaytambo.
One of the options is to take a private service with a travel agency, which will pick you up without problems from Ollantaytambo to make the tour to the Humantay lake, ask for this service with us and for prices at: info@readytotravelperu.com