If you are looking to sample some down home Shanghai food one place to try is Cun at 124 Jinxian Road (right off the Mao Ming lu, first restaurant on your right walking west from Mao Ming lu. I had been meaning to try this place for a long time, and was a little worried that when the Wall Street Journal said it was one of the top 10 in Shanghai it might be the end. I was lucky enough to have my office relocate to around the corner and finally got to try it. Its a very small place maybe 4 tables and is pretty expensive for restaurants in the Jia Chang Cai (family style) genre, food for five (including crayfish, shrimp and a fish) came to about 200 RMB. If you are looking for a down home type experience in Shanghai Cun makes very good renditions of Shanghais classics and the woman who runs the place is very much one of Shanghais ay-yis (~aunt). While it doesnt compete with the true home style cooking I am privy to in Shanghai its the closest thing I have found in a restaurant here.
The menu is in pretty constant flux and I didnt see an English one (but they may have one). I recommend just going with whatever the owner recommends, shell take care of you. The jelly fish and deep fried river fish are particularity good here as well as other typical shanghai dishes like fired crawfish, hong xiao rou and a tofu fish with long neck clams and persevered duck eggs. . It seems she has to know you if you want to get reservation but I had pretty good luck just showing up for lunch but be prepared to end up somewhere else.