Probably deserves 3 stars but it's so much better than that garbage Just One Day book of Foreman's I couldn't even force myself to get one-quarter of the way through. And anyway, I have little time and energy to sift through the trash that's being published these days so my standards have been lowered. 2011 me would have given this 2-3 stars.
I recommend this as a summer read that isn't full of fluff but not too deep. Those that liked If I Stay are likely to enjoy I Was Here.