Hello! It's November 17, 2014 and thanks to this old thread, I found amazing wool, alpaca, lama, and mohair! I wanted to post an update for everyone to say thank you to previous posters. Cuentapuntos has merged with Atelier Michelle Boison, it's best to seek them both out on facebook:
To visit the store, there is contact info on the facebook page for Whatsapp, and you simply make an appointment to visit. It was wonderful to meet Michelle and discuss yarn together. She was very helpful in making decisions. I was drooling over the colors and fibers - anything from lace on up in alpaca, llama, wool, and even 80% mohair blend in deep bright wonderful shades! There were cotton and linens, too, but I didn't ask to see those. I haven't been to Las Rosas yet, but it sounds a lot like the yarn district in Buenos Aires. I hope this helps the next yarn knitting fiend that visits Santiago!