Recommendable Chinese Classes in the center of Shanghai

I am so excited to write a review for my Chinese classes.
I have lived in Shanghai for 2 years, and it had been really hard for me to find qualified Chinese teachers. I FINALLY FOUND ONE (SILK MANDARIN!)

- qualified teachers in teaching Chinese with good English communication skills
: Easy to ask questions to teachers (especially for students in the beginner class)
- Relatively well-organized curriculum
- Clean and nice classrooms (the location is really good)
- Make an effort to make the classes improved based on students' reviews

I have taken group classes for a while, and now I am taking private classes. Both have advantages and disadvantages. You can try both, and choose one. They always respect students' opinions.

* The only problem is that the class fees are quite high, (and not refundable esp. when taking group classes) but still I feel like it's worth to pay that amount. (Compared to the other Chinese classes)