My daughter and I have been learning at That's Mandarin Beijing for almost half a year, and we feel very much satisfied with the school.
Teachers are all very professional; they're not only patient enough to let us talk as much as we want to, but also careful enough to point out grammatical and/or pronunciation errors as soon as they find ones in our Chinese.
The school provide us with a high tech teaching material both online and on a smart phone application, which is so convenient that we are able to review lessons anywhere anytime. Easy access to the class material as such is really helpful especially for those who are not full-time students like me.
I also appreciate the kind assistance of administration staffs. They're always taking care of us and give us a prompt reply when we ask them to reschedule our appointment.
I'd like to thank them all and I hope our Chinese would be better soon with the great help of That's Mandarin!