If you contact the housing office here in Grenada they have a list of "approved" rentals which you can contact. The main # for sgu in Grenada is 473-444-4175 and that secretary should be able to direct you to the housing offices/secretary. I assume they can email or fax something to you.
Alternatively, many use a realtor...I never have but I know several who have and were happy with the results. Some are linked as follows and are used to working with SGU students and will know which are on the bus route and which may be best if you own a vehicle.
Terra Caribbean: look for the rentals section or call them.
Island Reality
Realty World
There are a few others but these are the only businesses I have heard of which will cater to students.