It's a really cool tour. Enjoy it a lot. It is good to arrive in Cusco few days early to rest your body before starting the tour.
The trek is really challenging the second day, but the view is great. The tour guide is professional and funny:) Every day they wake you up with Coca tea, which is nice. The cookmen try their best to cook on the Mountain. It is really important to bring some medication for the changing altitude and more warm cloth.
It is freezing at night The first night and the second night, and It is really hot the forth day.