Well, I would not worry about accents. It is a lot of hokkum if someone says "We have the purest accent"or "you will learn better Spanish in our city/country" or "we speak the cleanest Spanish". What is really important is the quality of the instruction, and your own attitude. Location is really a minor consideration when it comes to language learning. I am an English teacher in Argentina, and I hear the same nonsense from people who say native English teachers from one country are better for accents than others.
For those of you who may be interested in learning Spanish in safer, more relaxed and beautiful Mendoza, here is a list of Spanish schools (it is often luck as to what Spanish teacher you end up with) and Spanish Intsructors prepared by a fellow Englsih teacher in Mendoza:
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" Links to Spanish schools and instructors in Mendoza:
Intercultural (aka ArgentinaSpanish, aka Patagonia)
Greenfields (aka COINED, aka Andino, aka DonQuixote, aka Cactus, aka languagecourse.net, aka Enforex)
http://www.coined.com.ar/
ECELA (Chilean chain with branch here)
http://www.ecela.com/esp/index.php
Intercultural (aka ArgentinaSpanish, aka Patagonia, aka Spanishcourses)
http://www.spanishcourses.com.ar/
Spanish in Mendoza Argentina (aka SIMA, aka Ana Marķa Troncoso, new website), more personalized one-on-one or two-on-one lessons,
http://spanishinmendozaargentina.greenash.net.au/
There is also Brazilia, which specializes in Portuguese classes, Spanish instruction but also has Spanish instruction:
http://miguiaargentina.com.ar/empres...portugues.html
Basically, at the larger schools there are some good teachers, but some stinkers as well. Some of the teachers at the larger places such as ECELA (often spammed) are not teachers at all (some of them have been English students of mine). Again, I do not recommend any particular teachers as most of them are also English teachers (like me) and friends of mine. "