What is the appropriate response to "Your Chinese is so good!"
是嗎？ (or 有嗎？ or 真的嗎？) 我覺得沒有很好吔。
Really? I do not think it's very good.
Really? I don't think my Chinese is very good.

or

沒有啦！謝謝你。
No. Thank you.
Not at all. Thank you.

You don't have to worry about this.
It's just like somebody asks a foreigner, "Where are you from?".