I play a lot with floorplanner.com This is the layout that I have set my mind on right now. It's roughly 6m x 3m (or translated 20 ft x 10 ft). On the left there's a sofa for the day that converts to a bed for the night.
open plan granny flat design 36 square meters - Google Search
POCKET DOORS...all my interior doors in Granny flat❤️❤️❤️❤️
The Master Floor Plan
400 sq ft apartment floor plan - Google Search
The Granny Flat Retreat(not this one just a picture) call & ask if they make them new. 0403581211 Stephen@spmgroup.com.au
... Apartment $50500 per person per - House plans under 600 square feet