Just had to comment on '...know nothing of China (unless you rent your own apartment)...' In fact, it's the opposite. Be prepared, if you rent your own place as opposed to school housing, you will need to learn Chinese fluently very quickly -- if something breaks, if it doesn't work, if you don't even have it, if you need to set up utilities, etc, if your landlord is mad, if the bureaucracy comes to you... All of which is quite possible and likely when it comes to apartments, even nice ones. UNLESS you live in major foreigner centres like Beijing, OR you have lots of close trustworthy Chinese friends -- which is a whole other story -- as in maybe they have guanxi with some contractor who needs work, and you are the sucker...

I would also be very curious how this 'person', or others like him/her, people who write these profane, insulting, mouth-foaming rants -- the classes you teach must be darn interesting, and likely utterly useless... unless you teach insults.

Finally, as to Tianjin, I worked at Nankai U. for years and it was fantastic. Yes, you don't make much money, but you're only in class 12 hours a week and so you can teach on the side as much as you want -- without having the school tell you 'you MUST WORK'. I like flexibility, you @%^&**&& guy.