Actually, cusco appeared to be safe to walk around at night if tourist safety precautions are properly complied with. That is, you can visit all the locations and more that this tour offers. However, if you want to bring DSLR at night, this is different story.
This tour is one of few night tours in Cusco. We don’t visit much locations during the tour, but the guide is offering good introduction with sense of protection to bring expensive belongings with me on each location.
After the city tour, we visit Pisco sour museum and local restaurant. Pisco sour museum is actually a bar, and you can make your tour own Pisco sour. This is perfect, one precaution to be considered is that Pisco sour is fairly so strong that this will make you drunk quickly. The guide is taking care of us until I return to my hotel. However, if you think that it is not good idea to walk the night street being drunk, you should drink less Pisco sour, or even reconsider this tour.