It's small, family run, good food, and friendly service. Usual startes and mains, but ask for any specials, take their advice and go with it. In my experience its not unusual to find the majority if the tables with Chinese whether local, or visitors. There may be "fancier", larger, and more expensive Chinese restaurants not far away, but it's hard to beat the authenticity of Red Sun, in this pretty Marylebone street.