I don't think he's pretty. But he has a great voice, excellent presence, and is very sexy. This was in person, which maybe makes a difference? I've not seen him on telly.
(It probably didn't help that the other person reading was Rick Moody, who isn't great at reading, was really jetlagged, and has the charisma of a wet fish.)
Oh, and I have a little book of his on architecture that's quite good.