I did rent two trekking bikes for just over a week to make the 260 km trip to Santiago. Both bikes were professionaly prepared by young mechanic Baal. He did fantastic job making sure the bikes are in top shape, and explaining us the first part of our trip.
Having worked for few years as a bicycle mechanic as well, I was really pleased that we had zero problems during our trip, not even a flat tire and the bikes did not require any adjustments.
On top of that I did book one day more by mistake, and I was not charged for it.
I highly recommend the company. Maybe they are not the cheapest around, but if you are after good bike, no problems and good advice, they are the one to use.