Yeah, I agree that finding a sublet for a short period of time while you are settling in would be ideal if it is possible. That way, you can take your time to find a place you can be happy living in.
Also, have you checked Western's site to see if they have off-campus housing listings? I am attending Trent, and have found their off-campus listings to be really valuable in helping me figure out my living situation for the fall from 2,000 miles away; for example, there are a few sublet listings on there, as well as listings for September, and I have been able to Skype interview and Skype tour some of the houses I am interested in.The people that post housing offers on there seem to be quite accommodating: they are interested in offering their place to students and, therefore, understand that many students will be coming from all over and have a tight schedule.