We had been to this restaurant often, especially when I'm dining with my aunts and uncles. This is their little "kitchen" and they often dine here (I was told at least once or twice a week)
Some of my favorite dishes in this restaurant: 1) BBQ fish (this is not on its menu, you'll have to call in 30 mins ahead for them to prepare it so that it'll be just ready for you when you arrived) 2) Prawn cakes 3) Tungyam soup 4) Tapioca dessert
Make sure you order the fresh coconut drink too. It's the best I've ever tried in HK.
The restaurant is easily accessible by MTR (subways) in Hong Kong. The station is Taikoo Shing. However, you need to look for a restaurant in this district is a little tricky. What you need to do is ask for the location of CCB (China Construction Bank) branch which is just across the street from it. If you are inside the mall, go to the direction of Apita & Broadway. Look also for Columbia Sportswear. There's a high-end furniture store and the Thai Pepper restaurant can be found just across from that very exit.
The restaurant is small, less than 15 tables, I figure. It's not overly crowded if you go early enough (that means before 6.30 pm, especially during the weekend!). Best to call ahead if you want to order the BBQ fish as it takes time to prepare it. The other excellent fish dish is the hot and sour fish with some soup, thai way of cooking.
Prices here are comparable to eating Cantonese food. It is a good restaurant though, simple yet delicious food! For 6 persons, the average is around HK$600-800, ie. HK$100 per person. Very reasonable indeed!