I highly recommend studying Chinese at That's Mandarin. My husband and I both took 1-1 classes this summer at the Beijing campus and thoroughly enjoyed it. We decided on the school after contacting several others and each doing a trial class. We found the sales process much more pleasant than others (less immediate pressure) and were impressed with the offering, including the ability to create customized curriculum with our teachers.
Personally, I found the school to be professional and well run. They've developed their own methodology, course materials, and accompanying software including a mobile app. They were very flexible with us when we needed to change some class times to accommodate weekend travel. I also found the teachers to be extremely knowledgeable, professional, yet personable. Every teacher has their own style but all teachers apply the same methodology. I found this to be very helpful as I was introduced to different speaking and composition styles. Lastly, and most importantly for me, I really had a blast getting to know all of the staff there. During class and on breaks, we discussed in Chinese everything from pop culture to politics, and I am even leaving with a stash of Chinese "dad jokes" :-D I can't thank That's Mandarin enough for this experience. If you are considering studying in China, I would definitely recommend them!