Advice when leaving the house

Hi everyone. I know that there is loads of advice about the dreaded crate training on here but I wondered what everyone does when leaving their puppy alone in the house in their crate. Is it best to be open that you are leaving so that they eventually get used to the idea or to be quiet and sneak out! At the moment I am like a ninja when I leave as Dexter my pup of 13 weeks hates his crate! But he goes even madder when he hears my keys rattle or the door or gate make a noise!