I did a week of 4 hours of Mandarin per day at TMI, and I loved it! It was set up as me and one other guy with an excellent instructor. She reviewed a lot and spoke slowly, using "charades" and repeating herself when we didn't understand her.
It was great. I wish so bad I had more than a week to spend at TMI, and would highly recommend it, they can help you with housing while you're there as well. I spent 1 night at a hostel and then they offered me a room. It was great and totally worth it.
If you've done your research I think you will discover that you will enjoy the city of Taipei more than probably anywhere in China you could do something similar. I lived in China for a year and even Beijing or Hong Kong does not have Mexican food like the burrito place right down the street from TMI!!!
What would you improve about this program?
I wasn't looking for academic credit, but to my knowledge, the school is not accredited. I don't know if there is a way, but that would be good. Again, I wish I had more time to go to TMI.