'My queen Karo' is good, in the first place by the convincing performance of its minor female star. To be more precise: given the role she has to play, loaded with lots of adult relationship-complications, her performance is stunning.
This performance surely makes the backbone of 'My queen Karo'. Apart from that, well, its picturing of left-side Amsterdam in the year 1974 is fairly adequate. Being an Amsterdam-resident in 1974 myself, I think it all a little too beautiful & idealistic.
Another prominent feature of 'My queen Karo': this film obviously is produced by a woman. Which shows in the heavy emphasizing on relationship-problems, in the non-erotic way nudity is shot, and, of course, in the strong focusing on the minor girl Karo.
When you are ready for parameters like this, you surely will enjoy 'My queen Karo'.