I own/lease rental property. I size up my renters.
go in person to apply and dress like you're going for an interview, because you are! Dress neatly, clean, casual/business casual, drive a nice, clean car---it doesn't have to be a Mercedes, but run it through the car wash and clean out the fast food crap!
Act business-like. Carry a notebook or clipboard or something to take notes, have a pen handy, have your stuff together, know your info like DL number, SSN, last addresses, have a check handy to make a deposit to show you're serious, wipe your feet before walking into the office.............etc, etc...........I don't have to rent to anyone. don't think those "equal opportunity housing" laws mean anything. I can't say I do not want to rent to you because you are A, B, C.....but I don't have to give a reason. I just say nothing is currently available.