I've always enjoyed urban fantasy over high fantasy. High fantasy tends to focus more on building the world (think Lord of the Rings). Some people really like all the detail and feeling like they're in a new land, but I've never been too fond of it. If that's what you're expecting from this story, it's probably not for you. This story doesn't focus much on building the world. We focus on the main character and our knowledge is limited by her knowledge. We see the training she goes through without really believing in the threat. It's more YA than anything. This is what I like, so I enjoyed the story. 
 I thought the narrator did fine. Her characters come to life and she brings emotions to the story. However, she's faced by the same problem a lot of teen novels have, and that is the narrator doesn't sound like a 15 year old girl. Harry Potter and Ender's Game are pretty notorious examples. Luckily the narrator sounds in her 30s which isn't a big issue. 
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