If you are looking for a school to learn Thai language with nice atmosphere and qualified staffs in Chiang Mai, I'd like to recommend 'Talk Talk language School.' The school is located near Nimmanhemin Rd. It has been teaching Thai for foreigners since 2009. There are many different courses to suit your needs. You can try one of their 30 hours(short course) or enroll for the long course of 200 hours which also includes an application for a 1 year Education Visa
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if you cannot see the phone number and the link, please fee free to message me anytime.