This place was perfect and David is so helpful and super quick with responding to my messages. Nothing was an issue, though my plans changed a number of time. The position is perfect with easy walking distance to restaurants and the beach. (You must try the coffee shop and restaurant at the end of St Kilda pier.)
I know that people have mentioned the noise of the traffic and I was a little concerned as I can wake easily, but I really didn't find it an issue. Slept like a baby on the nice comfy bed.
I hope to make it a regular stop when I'm in St Kilda.