We had a great experience with Chero - booking was easy, quick, and thorough. Communication was excellent. Our driver and tour guide were very good, and the hike was beautiful. Izalco is a shorter, but much more rigorous hike than Santa Ana. I'm not sure I would list it as "easy" on the website; some places list it as "difficult." But that said, my 12-year-old daughter and her friend were able to complete it with me.