Take MRT to Tanjong Pagar. Walk to Amoy street market till u reach the end of the food market, u'll see a small temple (dun know wat name) at teh corner. Just carry on walking and follow the road toward China SQ. THe restaurant is somewhere in the middle of the stretch of road. ~ 5 - 10mins of walking distance from Tanjong Pagar MRT station.
Cheers
JC