Not good, not bad either.
Too much of the book is just the MC doing boring or pointless things that don't even belong in a journal, let alone a book. Every time the MC goes to the toilet, drinks some water, lifts a box ... all actions without any importance to the story, and yet all put in, just to swell the page count. The only thing giving the book the "not bad" qualifier is the little bit of action towards the end. I understand inspiration is hard to come by, but it's getting ridiculous.