Shanghai housing options for a family of 5

My family (me, wife, 3 kids ages 8,6,4) are spending July & August in Shanghai. We'd like to stay in the French Concession area and have a budget in the RMB 12-18,000 range . Any suggestions on best ways to find housing?

Hi Yingers:
I heard of a website. Http://www.stayin shanghai.com. It is owned by expats and work for expats' family. It is said that it is a website about housing in Shanghai. I hope it can help you.

https://www.stayin shanghai.com

Hello。 this  is Gavin from loveshanghai property agent, i would like to help you get a good property in shanghai , if you have skype , we can chat directly , thanks . my skype : ***

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I dont think you will find any large decent accommodation for in FFC Shanghai within your budget.  Maybe  within another area. Try booking.com I've always managed to get nice deals in much smaller cities in China.
BTW, July/August can be extremely hot and humid in Shanghai!