My husband and I thoroughly enjoyed our time in Melbourne and a huge part of that was having such a great place to stay. A few points worth mentioning:
Cons-
The space is quite small, even than it looks in the pics. In America, I would say it would be considered a studio (although their is a sliding door to separate the bedroom). Although the size didn't bother us at all since we were really only there to sleep!
The noise level on weekend nights was a bit loud. The apartment is right next to several restaurants and bars and on Saturday night in particular, the music was loud enough to disrupt our sleep. Otherwise weeknights were totally quiet!
The bed IS a very comfortable bed, but it is SOFT. My husband and I both have bad backs so several nights in a soft bed does tend to cause some pain. There were plenty of pillows so we were able to use those for extra support and make the best of it, but it was something that would've been nice to know beforehand.
Ok now Pros-
The location is AMAZING! Everything you need is within 10 minutes walking distance. Public transportation, grocery store, beach, bars, restaurants- everything!! Plus the area of St. Kilda is incredible. We could have stayed in St Kilda for our entire trip and been totally content. Definitely walk and explore the surrounding area, that's where we had some of the most fun.
The shower is nice. There's no bath, but the shower head is one of those rain kind, and my husband loved that.
Communication with Geri was 100%, even while she was traveling out of the country herself. She was super friendly, accommodating, quick to respond, and even helped me out with questions I had prior to our stay. Check in/out were ridiculously easy and there are a lot of nice little touches in the apartment to better your stay! (Tea, instant coffees, myki cards, etc).
All around I would give this place 90% and would definitely consider staying there again if we ever return to Melbourne!