The Diamond is a Grand Class ship. The AC mini-suits are about 300 sq. ft. and the balcony is about 50 sq. ft.
"Twin beds that make up into a queen-size bed. Separate sitting area with sofa bed and desk. Balcony. Two televisions. Refrigerator. Walk-in closet. Bath with tub and shower. Approximately 354 square feet, including balcony."
This is the category that we have used on all our Pincess Cruises.