If it wasn't for the historical setting and details, I would have rated this book lower.
Pros: The world-building and music set it apart from the usual "girl falls in love with hot, dangerous non-human."
Cons: Unfortunately, it ultimately fell into the same tropes of instalove where the love interest has a split personality of violent/dangerous creature vs goodhearted/kind person and he has to withhold sex for her own good. Ugh. The ending is somewhat open ended and may be setting up for a series.
This book was a mix of Labyrinth (yay) and Cruel Beauty (not a good thing, imo). The Hollow Kingdom series does the goblin king bride story in a better way without the cons.