The good - good size well-kitted out room with 2 queen beds, separated by the bathroom. Decent east facing view. I found the 15th floor room quiet.
Not so good - 1. The beds were very soft. 2. I got sent a text to pay for the room when I'd paid already, which was a little stressful. 3. The bathroom had a smoked glass door and had a gap in it, so people outside could see into it and see it reflected in the mirror outside the door! 4. They told me they had bag storage after checkout, but on checkout I was told there was no room (never had this happen anywhere before, and my bag was small so they could've found a spot).
Also just be realistic that you are a few minutes on the tram from the CBD, and a decent journey to the MCG or tennis centre. But if you want to be out a bit, handy for Albert Park, between the City and St Kilda, this is fine.
Based on this experience, I will be looking at other options in future.