We hired Lucas Altuna of Iguassu Misted Falls Vacations to be our guide at Iguazzu Falls this December, 2008. We made the reservation last January and had several emails confirming it. When I tried to reconfirm our reservation in November, Lucas did not reply to my emails. When I finally reached him by telephone after numerous attempts, he said he would meet us at the airport at Iguazu as we had planned. I emailed again in December for final confirmation and called him from Buenos Aires a couple of days before our arrival in Iguazu, but got no response. We telephoned the Iguazu Jungle Lodge (which Lucas had booked for us) to see if they could reach him but they tried and could not get him on the phone. They finally spoke to him the day before we arrived (we did not find this out until we arrived)and he told them he would not be coming. He gave them no reason. They sent someone to meet us at the airport. We still have not heard from him--not even a word of apology or a reason for not showing up!!
We had been planning to go to the Brazilian side of the Falls with Lucas who told us he could get us there without a visa. After we arrived, we asked others if we could go there without one and they said it was risky, so we did not go. This was very disappointing.
Lucas' behavior was extremely unprofessional. I advise others to NOT use his services.
By the way, The Jungle Lodge was lovely and the people there were very nice.