This literally is the most amazing Tea Room I have ever been too. If you ever go to Melbourne you must try this, it's like a little bit of heaven fell right here (and I do not mean that metaphorically, it literally is that good).
Basically it is always full, and you may have to line up and wait around 15-20 minutes. Trust me it's worth it.
If your going there for afternoon tea, they have a lovely list teas, I suggest 'Strawberry Kisses', if you like fruity teas. They have a huge variety of cakes displayed in the window, It's very very hard to chose just one.