Fantastic hike. Go lite, take only your essentials ,unless you already have a porter to carry everything for you, in the office they will tell you bring lots but the hike is very intense in parts so one wet outfit and one dry is enough.
Raul our guide is one in a million funny. Food is great, maybe a little too much to each, toilets well if you can call them that be prepared,(stinky) vicks to rub under your nose may help but overall chance of a lifetime, a must do.
Aguas Calientas is worth staying the night and getting the day train back because the scenery from the train should not be missed, taking the night train back, no view and very tiring after the hike.
I loved it all anyway. Enjoy.