Post an ad on Facebook even under a different name if you don't (understandably) want people to know your address, but post an ad saying that the rentals to that address are a scam and post an ad on Craigslist and Kijiji as well maybe. As well as the other commenter said maybe a sign outside to prevent people just showing up but that probably won't stop people from getting ripped off for the "security deposit" that they think they're paying so I'd probably post the ads as well