Your essay is enjoyable to read and very personal. I like the way you flow the story. You also make some brilliant phrases such as :
I would love to throw a frisbee with you, draw you a portrait, or go on a nature hike with you
I will be happy to share my dark chocolate with you if you will share your opinions and passions with me.
However, if I were to be your roommate, I want to know more about your personal characteristics, not only your diet. I want to know if you are talkative, critical, calm, etc., so I will know how to befriend you. You should write about it, even with only small portion.
After all, good luck on your application. I'm applying to Stanford too, so I'm looking forward to meet you as freshman in stanford next year :D