I ran one rental ad on rentboard, kijiji and rentfaster in April for a main floor suite in Edmonton.
Here are the results: Rentboard five inquiries by email. Several by phone although I didn`t keep track of the phone calls - probably about five to seven though. I did not modify the ad during the course of the run.
Kijiji - 15 email inquiries. No phone calls since I didn`t post my phone number on kijiji. I did repost to keep on the top couple of pages and I used several different headlines
Rentfaster - nothing except the invoice.
I used big 2 rent signs in the front lawn at my rental home. I put them up at 5pm last week, had 2 calls that night, 6 calls next day, 5 the next day after that. I haven`t advertised anywhere else.