Professional school

Great school to learn Chinese
I started learning Chinese with that's mandarin in January 2022, and my experience so far has been great. I didn't have much expectation as I am not good at learning languages but my teacher is amazing, she is full of energy and joyful and it really helps.
They have a webapp you can use to review all your lessons and it provides writing/listening exercises, I find it quite useful at it allows me to study during my commute time and you don't have to carry books.
I didn't try other schools so I can't really compare but overall I believe that's mandarin provide a wonderful experience for learning Chinese.