Experiences obtaining preliminary rental contract

Hi there,

I was recently admitted for a master's program in logic and AI. I am coming from the United States and need to start working out my student visa. I was accepted for the summer semester but I did this sort of strategically as my intention is to join in the fall and I wanted to buy myself some time. I applied to Akademikerhilfe for a preliminary rental contract but have not heard back maybe because I'm applying for places that will become available for move in around September. I've looked at all the recommended student dorms on the TU Wien website and I know theoretically what I need to do but I'm fishing for more information from other's experiences getting this done. Would appreciate your input, thank you.