Don't get me wrong, I loved this book. Thing is, in the end it got more and more saccharine and unrealistic. I still recommend this book: I was invested with the characters and their stories, although they were simplistic.
Heidi is such a good-natured creature that it almost seems she's incapable of anger, which might be unsettling or unnerving to some. But to me it was the perfect book, it's definitely a cheerer-upper and if you're feeling down, you should definitely check it out.