Storage under the stairs? I love it in any size home! Can you guess what stops me in my tracks? The lack of a railing. I'd have to have that to feel secure especially if I shared the space and we might be passing on the stairs.
I like a loft bed provided I can stand in the space. I don't want to have to slither into bed and crawl around on my stomach when it needs to be made. With that said if you are twenty something, you probably won't give that a thought!
This image doesn't represent a Tiny Home situation but a masterful used of space. You could, of course, hang a rack like this in any size home and get your utensils off the counter or out of a drawer. Everything about this image makes me smile. It's the same effect I want you to experience with all of your Zen Organizing TM projects.