The obvioius has been overlooked. THIS very site has listings for roommates an/or apt. rentals. Agencies that provide this service are very expensive and they only hand you a sheet of paper and no guarantee the apt./flat is available. THE best thing to do is be prepared to stay in a hotel for a month or so [I can get that for you] then just look around the area where you want to live.
Also, wehonews.com may possibly be of some help.