Like White’s biography of Leonardo da Vinci, I’ll confess I picked this up mostly because Machiavelli is an important character in the game Assassin’s Creed 2 (and at one point he even makes a reference to The Prince in the game). I haven’t read The Prince, but I had a certain idea of the content. White’s key point in this biography is that despite the aura of disreputable scheming around Machiavelli, that wasn’t his intent in writing The Prince, and he served Florence well and faithfully. Mostly, he was a shrewd strategist and diplomat, and an observer of human nature, who doesn’t seem — at least in White’s account of it — to have got the respect he deserved.
White’s biographies all seem to be pretty well sourced, and they’re very readable. I’d recommend them.