I have in the last few years started listening more to Schubert's music. My favorites are his piano works, especially his late piano sonatas. I have started reading, but couldn't finish, a couple other Schubert biographies. I was interested, but not that interested. I didn't need something with too much depth. So for me, this was just the right level. The author makes a repeated point that the common story of Schubert's life is that he was relatively unknown during his lifetime. In fact, while he wasn't a Beethoven of the times, he was known and appreciated by famous musicians of the day. He is well know for the "Schubertiades", evenings with friends and Schubert's music. This author looks at who influenced and who was influenced by his music. No less than Schumann, Liszt, Mendelsohnn and Brahms all did much to promote Schubert's work.
I like a quote from "The Musical World" in 1839, a Paris periodical - "All Paris has been in a state of amazement at the posthumous diligence of the song-writer Franz Schumbert who, while one would think his ashes repose in peace in Vienna, is still making eternal new songs, and putting drawing rooms in commotion". This is because Schubert left many unpublished works which were being discovered and performed for years after his passing.
Having an interest in classical music and the people who were part of it, I enjoyed the book.