Very poetic and philosophical, a lot of introspection. The writing itself is beautiful and the main reason I kept reading after the plot started getting drifty. 
After the first hundred pages the story became repetitive and while I understand it was a conscious choice on the author side (so we get to experience the protagonists emotions) it got me disconnected from those instead. 
The weakest point, imo, is the character development. And as a character driven reader, that soured the experience for me. Personally, I don't vibe with the "she's not like other girls" trope. So, may be a compatibility issue. Even more so when all we get to see of her is that he's pretty, she has freckles and she's stubborn. 
Also, if feels like a wasted opportunity to have a character living for 300 years, with the skills and the opportunity to move around the world and making it so eurocentric that we only get a few mentions of other places around the book (except for New York). 
For some reason, we got so many details of certain moments of her life and then so few from others that would have been way more interesting.
In general, it wasn't a bad experience. I enjoyed the atmosphere and the imagery. The book has many beautiful moments and quotable phrases. If those elements speak to you as a reader, I'd recommend it. If you're a character driven reader, or if you are a fan of fast paced books, this is probably not the best choice for you. 
Overall, my reading experience was 3.5 stars, rounded up to 4