I'd be interested to hear from anyone who regularly goes to some little-known restaurant (hole-in-the-wall type, perhaps) where there is consistently good (safe) food, friendly service and great prices. Let's share our food finds!
My recommendation is a Muslim restaurant (green façade) on FengZhu Street, just round the corner from Robert's School and next to a bright yellow school and rubbish disposal centre. Opposite a shop called "AAA".
Despite the dodgy-sounding location, the proprietors are very friendly and the food is always fresh and freshly-cooked. The café gets busy with local schoolchildren midday, but is quieter at other times. Typical (large) noodle or fried dishes cost 12-18RMB inc free beef soup. Never been ill from eating there. Try the "XinJiang BanMian"