Highly enjoyable. I liked that it was in a modern setting with (mostly) real places, the set up was very good, and drew us in without giving too much away early on. I did predict the other warrior quite early on, and some aspects of the ending of the novel, but it was still a fun ride to get there. Whenever someone is the 'last' of something, or the only one in a long time, it's always interesting to see how the lead character takes on their role. I would've liked to spend more time with the Aunt Linda character and perhaps see more things from her perspective. It was also annoying that one character in particular was left out of the loop the whole time. It's ok for a while, but people are no better off not knowing things! It's even acknowledged in the book for this to be so! Just a small gripe anyway. Perhaps she'll be more informed in the later books. 
 Also, there were too many instances of "not fighting a woman" or "fights well for a girl", etc. While I acknowledge that it was a learning curve for the protagonist, that doesn't mean that it could not have been simply an accepted part of the overall world. If the story and author creates a world where it is normal for females to be warriors as well as males, then it makes it easier for readers to accept this as well. It frustrates me so much the amount of internalised misogyny that exists in so many young-adult novels. Stamp that s--t out! How are young women supposed to assert themselves in a male society if these kinds of ideas a littered throughout the literature they consume? *rant over* 
 I recommend this book. It's a pretty quick and easy read and ticks the boxes of a fantasy novel without being too heavily involved.