First of all, Chile is an awesome place to go if you want to experience all types of scenery, practice your Spanish, eat awesome food, and meet some of the kindest people in the world! Chile has the driest desert in the world, an amazing coast, mountains in Patagonia, and so much more. No matter where you are, there is so much to see. That being said, pack for all climates if you choose to study here because likely you'll want to see a little bit of everything!
As far as the university goes, it was a nice mixture of courses taught in English as well as Spanish so that you can do what is best for your current level. They also have a great program that allows you to volunteer while you are there. I chose to teach English a few hours a week and others did activities with the local orphanage, planted seeds at gardens, spent time with disabled people at the hospital, and a few other things.
Lastly, my host family really made me fall in love with Chile. They became my second family while I was there and we have kept in touch since. They were the kindest people ever and it was also really good for me to practice my Spanish. You must stay with a host family if you go here!
Safe travels! :)