Zhè zhǒng qīngsōng de diànyǐng zhèng duì tā wèikǒu.
This kind of light-hearted movie is exactly to her liking.
Tips
usage
Although 胃口 literally means 'appetite,' 对胃口 extends beyond food to anything you find agreeable — a movie, a book, a person's personality. Negate with 不对胃口 (bù duì wèikǒu).
memory
Think 'matches the mouth of your stomach' — if it fits your 胃口 (stomach-mouth, i.e. tastes), you like it.