I've visited Chapelco last year in the end of august for 6 days. The mountain is pretty cool. Varied terrain and great tree-skiing. Because the area is difficult to get to, very few tourists are there. Snow was absolutely amazing because it snowed for 4 days during my stay. However, normally the snow shouldn't be that good in the end of august people told me. The mountain is a 30 minutes ride from San Martin de los Andes. A nice town with good accommodation and very good food. You can stay in hostels and hosteria's if you travel on a budget and in hotels if you got more to spend. There are shuttles which take you to and from the mountain. It feels like a typical argentinian experience.