Another great find in Harbour City is 小城知味 (E.C. Eatery). We actually spent almost all of our time in Kowloon (not Hong Kong side), and a large part of it was in Harbour City. This is a cafe type of place that serves a variety of different stuff... rice, noodles, and everything in between. Pretty cheap too. 
hainanese chicken rice 
potstickers 
braised short ribs with rice noodle in xo sauce Hainanese chicken rice is one of the signature dishes here, and it was great. Very tender and juicy. The rice was fragrant and tasty... could probably eat it plain. The potstickers were very good. Meaty and juicy on the inside. They also used Chinese chives (I think that's what it is in English) for the filling, which is pretty unusual for a potsticker (though common for dumplings) but turned out pretty tasty. The rice noodles were okay. I didn't find them too interesting but I think my dad liked them more than I did. On a side note, the Arthur Hungry 1 Year Anniversary is coming this Wednesday, Oct. 6th. I'll be doing nothing! Woo hoo.