The writing is exceptional. The author does a great job of describing scenes and environments.
The pacing is also really well done, it's neither too fast nor too slow.
Information about the world is given often and in good amounts. The reader never feels overwhelmed with exposition while receiving just enough information to continue reading.
The MC is very well designed.
From what I read, it also didn't feel like a standard, unrealistic romance.
A very well written novel!