The reason I was asking for help in this forum in this particular case was that I have never done anything like that before so excuse my inexperience.
My profession is project management where risk assessment plays a crucial role when preparing a project approach. Relocating overseas is a big project for me and my family therefore wanted to find out if the terms proposed by Kris (only as an example) are the industry standard. Now I know already that these terms are standard so the risk is mitigated.
In my experience with accomodation I usually dealt with hotels where you pay only a portion of the whole amount to secure the booking. The rest is paid when you leave.
Now I have learnt that the short rentals are different not only in Adelaide but also in France - you pay the full amount upfront - period.
Thank you all again for the lesson.