"Que Ling", or as it used to be called, "Boston Restaurant" was a good old-fashioned HK Cafe with good brunches and value meals. Even now that they've swapped over to Vietnamese cuisine, I still head there mostly for their HK food.
The secret to the place is to NOT order the Vietnamese food - that's not what their chefs or original owners ran the restaurant as. Go for the lunches and order their baked food, it's much better than ordering their Vietnamese food and more authentic as well.
(Also as with most HK Cafes, don't go for dinner - same portions, upped price)