As part of my ongoing “one C.S. Lewis grown up book per year” target, I picked up Surprised by Joy. This is his autobiography, but focussing solely on his journey towards Christianity, finishing with his conversion as a young adult.
A lot of the time seems to be given to his schooling in various forms (“Life at a vile boarding school is in this way a good preparation for the Christian life, that it teaches one to live by hope.”), and then through WWI, university and into work in academia. I enjoyed reading his story, but occasionally, and more so towards the end, he got quite philosophical, which got a bit too clever for me, which I’ve found to be a common occurrence with these books.
He’s friendly in the way he talks though, and quite self-deprecating, at the end of chapter one saying he’s written it so that people can “see at once what they’re in for and close the book with the least waste of time.”
ineke.co.uk 
Anything to add...?