I live in a shed. It's a late 70s/early 80s timber-built shed. With a tin roof. This is Australia, so all bedrooms fit a double bed and have fitted wardrobes. The nice thing, and I can see the OP's gaff lacks this, is a second living/sitting room area downstairs.
Another good thing we have is doors, and this is because the design is older. Lots of Aussie homes are horribly open-plan, with tiled and/or timber floors which, coupled with no doors is a frickin' nightmare of noise. We can close the doors between front and back, and have a life!
What do I like best? The front room which has floor to ceiling windows down one side, about 20 feet, which looks onto the side passage, about 5 feet wide, full of plants, mostly of the house kind you can grow outdoors here.
Not so good? No hallway, so nowhere to park shoes, hats and coats which doesn't involve a trip across the carpet.