Mama Simona was a great choice for my stay in Cusco. The staff was friendly and helpful, the hostel was clean and inviting, and the beds were comfortable and warm. Quiet hours at 10pm were enforced which was nice, since nothing is worse than staying somewhere where you can't get any rest. Small breakfast was included with my stay, and endless supplies of coca tea, which helped with the altitude. The rooms have lockers for storing important docs, bring your own lock, and the hostal sells water on site. It's also close to the town center and in a safe neighborhood.