Booking with Nattrip was one of the best decisions we made during our recent trip to Brazil. We were coming from the United States and wanted to backpack Petropolis to Teresopolis. Communication with Nattrip was straightforward, efficient, informative, and in fluent English. I paid for the entire trip upfront via a link provided with credit card. Nattrip was able to organize gear rentals for us -- tents, sleeping bag, sleeping pads, and a hiking backpack -- so we didn't have to bring so much gear from the United States.
Our guides were Luiz and Leo. Luiz was fluent in English, extremely knowledgeable about the flora and fauna along the trail, and very competent. His passion for nature was contagious. I left the hike with a renewed appreciation for the Atlantic rainforest. Leo was compassionate and emotionally intelligent; he sensed when my friends' fear of heights was starting to climb and would offer a hand on a difficult scramble. Luiz and Leo carried the food for our meals -- breakfast/dinner were always delicious (especially by camp food standards) and lunch was sandwiches with salami/cheese/peanut butter. Luiz sent us the menu prior to the hike and was able to make small adjustments for us.
As for the hike, we hiked in the second to last week of March. It was rainy, but not beyond enjoyment. The first day of the hike involves a lot of ascent, but the trail is nontechnical. The second day of the hike involves primarily scrambling, both ascent and descent, and involves three technical sections, including the use of ropes and harnesses. The third day is a lot of downhill. The views were gorgeous and we had a great time!