It's just one of those things in life. We love the people whose sincerity forces us to abandon all pretence; with whom self-awareness gives way to unthinking ease of being. Those who encourage the best in us and for whose sake we strive to be better.
The people we want to sit on the sofa with after a long day, munching on popcorn, aimlessly channel surfing. Delicious homemade dinners or boxes of Chinese takeaway over nostalgic reminiscences of holidays & beautiful summer days or snowy winter mornings. Impromptu boogie nights to appalling disco classics, totally lame moves and nil embarrassment, because it's fun to not care. And when we don't care, we are free to be ourselves, free to be perfectly content.
When you're that happy, what more could you need?