In a nutshell, you need a guarantor to promise that there will be no problems with rent payment. If you need a guarantor, it's a good idea to line one up before you start your search, especially if you're looking during the busy summer season.CityFHEPS is a rental assistance supplement program to help individuals and families find and keep an apartment,. Usually, yes, it will depend on that person's credit of course. Keep in mind that this person is basically taking on the responsibility of paying your rent. If and when a renter needs a guarantor depends on several factors, including credit score, credit history, and income, to name just a few. All occupants over the age of 18 will submit an application and must meet all criteria specified for the primary applicant.