Some others below have written that this restaurant is on the second floor, but it wasn't anymore when I went (May 2015). It had moved to the ground floor, just past the noodle place.
Also, the address indicated here is 999 Jiangning, but when I went last month (May 2015), where 999 should be it was all boarded up, looks to be due to construction. We entered slightly to the north, at 1017.
They wanted us to buy a meal coupon at the entrance to prove we were going to the restaurant and not trying to sneak into the temple for free. One of us in the group who could speak Mandarin asked them to walk us to the restaurant instead, but then they just ended up letting us in after all.
The place had lots of round tables, the menus had photos, and the food we ordered was delicious!
As for directions... From Changshou metro (lines 7 and 13) take exit 4 and walk east (turn right) on Changhshou, then go south (turn right) on Jiangning.
Cons: poor service, difficult to find, no English spoken