I love pretty much everything Studio Ghibli has done. This particular film is on the favourites list because of how very Japanese it is. The folklore and many other aspects are so clearly drawn from the culture, but you don’t need to know anything about Japan to enjoy it.
Such a great range of characters and a great mix of humour, sadness and joy.
It has a visual richness that you don’t always get in animations, though Studio Ghibli are experts at that. And the story is lovely.