It chilled me and yet at the same time I found I couldn't tell myself that this was an imaginery world. This may be an AU, but it sure as hell isn't an AR.
I was repelled by the beginning, but forged on. OMG! What a world! Grindelwald, not Voldemort. That took a little getting used to. But it works and works well. Bravo!
One day, the Prince Estate could easily hold a dozen little girls and even a boy or two, but there would be no rush to fill the bedrooms.
Stuck in their little corner of the world, they will find a sort of peace, all the while knowing what exits beyond their borders.
(Read very much, now that I think of it, like the so-called Dark Ages. Which makes sense for the Dark Lord who is at the head of it all.)