Looking for an intensive course 2-3 weeks in Taipei for learning mandarin language. Can anyone recommend one?
Taiwan Mandarin Institute. However, 2 -3 weeks will not get you far unless you have foundation Mandarin speaking, reading and writing skills. Depends on your level but make an goal what you wish to accomplish in 2 - 3 weeks time.
For a short term course (not sure if they do just 2-3 weeks) but the main school foreigners go to is http://mtc.ntnu.edu.tw/mtcweb/index.php?lang=en. They are very well set up and have very well structured courses.
I went there myself and was very happy with it.