Just only have one issue, I've been to Siam Thai a while back. The cuisine was far from Thai. Biggest faux-pax was their Pad Thai, it was made with hokkien noodles and tasted nothing like a Pad Thai. My reference Pad Thai is the one from Thip Samai in Bangkok.
The Stanley hotel has a Thai restaurant, I have not been there yet. But will post here after I do.