As Randle has mentioned here before, whatever you do, please don’t answer this one with “I’m a perfectionist” or anything else along those lines. Sure, it might be true, but it’s also so commonly heard that it‘s completely unoriginal, and in fact, it’s more of a strength than a real weakness. Rephrasing it as “paying attention to detail and wanting to get things right” doesn’t sound like much of a weakness, does it?