I had a great time on this trek, albeit a tough one. It's an amazing trek and pushes you to your limit. Fantastic views ! From snow capped mountains, rivers to jungle and rainforest. Extremely full on.
All of the Salkantay.org crew are very helpful - sort your bags etc, good food provided and lots of hot drinks which is helpful because it's really cold ! (Although there could have been a bit more food there is often extreme long gaps of walking between food which leaves you starving, they do provide snacks though which is great). Try to take your own water.