I'm enjoying this biography, but for me it is lacking a little bit in commentary on Nietzsche's work.
There are some references, but they seem superficial. While I understand that the author may have wanted to focus on the biographical aspect of her subject, I would love to read more of how Nietzsche's thoughts may have developed.
What references there are, may make sense to a student of Nietzsche's work, but don't really provide much insight for someone who's not studied the works of Nietzsche and his influencers in depth.
As a result, some parts of the book read a bit like a list of appointments between Nietzsche and others, but don't relate much of the importance of such meetings.