I learned about this company from a fellow student at my Spanish school. I would have never heard of Salkantay nor had the inspiration to go to MP if it weren't for her. She had great reviews so my friends and I decided to go with this company.
The guides, Roger and Juan, were super great and very helpful. The cooks were amazing and accommodated my vegetarian diet. I really appreciated how helpful and kind the whole staff were for the whole trip.
Some advice -- bathrooms cost money at most stops. If you go during the winter, it will be cold and absolutely bring warm layers, even if you don't think you need it. I regret not bringing enough layers. You might need some Dramamine if you get carsick easily. I would also recommend going for a slightly more expensive hotel in Aguascalientes.
Overall, it was a great trip and I recommend this company.