Used the Myer Melbourne parents room on Saturday.
It was on level 3 where the children's clothes were sold. Large-ish room. 2 parent child toilets. 2 cubicles for privacy of breastfeeding. 10 single armchairs to sit and feed (formula/ breast). 2 nappy change areas. sink. microwave. quite clean. I think I'll give it a 4star.
QV shopping centre had recently renovated its toilets on ground floor. 2 baby change toilets, of which there is a plastic chair that you could sit in to breast feed in private if desperate. No separate door/ cubicle for the toilet though. Felt and smelt like you were breast feeding in the toilet still. There was a microwave in the baby change room though. 2star.