My own experience in China was an amazing.
I've spend 9 month with my host family and from the start they treated me like a family member. I've been taking care of 5-years old boy, and he was adorable.
The thing I would like to tell everyone, who's considering coming to China, is that it is not for everyone. The culture and habits can shock or confuse sometimes, but in general, once you get used to it and will be open, it would turn into a great adventure.
When I first came there, I felt homesick, because surroundings seem so different for what I got used to, but then I just got into it.
Chinese people are very friendly to foreigners. People on the streets are always trying to help, even if it's hard for them to understand you :D
In general, I'm very happy about my decision to come to China.
Good luck everyone :)