The Restaurant at Novotel Bangkok on Siam Square
Novotel Bangkok on Siam Square's restaurant is endorsed by professional travelers. Of the 5 publications that we tracked, 2 acknowledged the restaurant, such as Frommer's and Fodor's.
Novotel Bangkok on Siam Square 
Frommer's
Fodor's
Frommer's "If the more-than-adequate Chinese or international restaurants are beyond your budget, head outside, where there are a bevy of cheaper noodle shops and a variety of Western diners, from local pizza parlors to donut chains, filling up Siam Square's packed back streets"
Fodor's "Besides Gourmet Bar in the lobby, the hotel is known for Lok Wah Hin--a Chinese restaurant that’s popular with locals and has a great Peking duck and dim sum"
