I was just wondering if the OP is still going on their trip - they mentioned that they would be in Lima for 2 days as part of a larger trip. Most folks do Lima as a stopover to Cusco and Machu Picchu - but there has been dreadful flooding in this area, and in fact, the railroads to Aguas Calientes / Machu Picchu have been washed away. Estimates are that it will be at least 2-3 months before they are fixed.

And that's pretty much the only way into the Sacred valley to get to Machu Picchu. So, NOBODY is going to Maccu Picchu in the next couple of months at least. Cusco has also seen significant flooding, although nowhere near as bad as the area just below Machu Picchu.