I went together with my parents on several tours in Cusco. After seeing the Sacsayhuaman ruins on a mountain just behind the city center on our own and visiting some museums we felt it was time to do some guided tours as well. We quickly found the office and were helped out by local staff. Everything went easily and smoothly, we received some useful tips and a lot of information on our booked tours and after just 30 minutes walked out with train tickets to Machu Picchu in our hand and a booked tour to Maras and Moray. All in all, the agency looked very professional, gave lots of information and they worked quick in order to still get places for us on the Backpacker Train. The tours themselves were great, we took many pictures and our guides were professional with a great sense of humor!

We scheduled 2 tours with them. Sacred Valley tour was alright, we ended up getting in over an hour late which screwed up our travel plans later in the night. We then were supposed to do the mountain biking tour. At the last minute the moved the time up two hours to 7am pick up. We were picked up at 650am then made wait in the parking lot until 720am while the guides figured out transportation. One guide then settled on taking us by public bus. It was obvious that it was not organized at all and we felt uncomfortable and unsafe where they took us. We decided not to do the tour and were then told that we could get no refund because everything was already planned. Even though the guides told us they had been told little information before picking us up. Not worth it at all, each tour had extra entrance fees(which were not clearly stated or specified in the voucher), organization was poor, service and guides were just mediocre.

Just returned from fabulous 14-day trip to Peru with lots of sightseeing. The only glitches were thanks to Dos Manos of Peru tour operators. We booked 2 tours and paid up front. The first of the Sacred Valley ran 90 mins over. Not because we were seeing so much, but because they couldn't keep us on time, our bus couldn't go over 45-mph so we got passed up by every other tour bus UP HILL, and because a couple stops were clearly just to 'shop' local merchants. At the second stop we actually left a family BEHIND because they didn't get back to the bus in time.... even though we left that spot 25-min behind schedule. They did catch up by the next stop but had to take a taxi.
The worst thing Dos Manos did, however, was fail to deliver our Christmas Day mountain biking tour in the Sacred Valley. Too many screw ups to mention, however when the tour guides they sent tell you THEY just got booked the night before (we'd booked the trip in September) and tell you THEY don't know how to get us to the starting point 2 hours away.... you KNOW you have a problem!!
We used other companies for other tours that all went off without a hitch. DO NOT use Dos Manos!!!