Foxglen has furnished 1 bedrooms for like 650, you can find places all over for about 6 hundred (unfurnished).
The Ramada also has a discount for Ross students which is nice, especially if you are only going to be there for the short term. As far as what is dodgy or not, stay west of the river (Google map it) Saginaw township is very safe, but east of the river is sketch. Other apartments that I looked at were Normandy, Castle something, and some other ones of off bay road. If you really want to save money rent a room or even a house. The housing market there is so dire that they will take almost anything.
Feel free to PM me for more info
RJ