I suspect there isn't much you can do to change the landlord's behavior or convince her to rent the property to you. 

Ask yourself, if they're exhibiting this behavior now how will they conduct themselves once they become a tenant?

I know it may sound as a BIAS from my side but I think this should NOT be legal to put covenant, see my logic here a builder build a whole community and one part of it is rentals the rest is single family, they put covenants and restrict the market to rent by room just to ensure they can rent their rentals that is a sort of monopolistic behavior and should not be legal.

However, it was not something that we planned on and I did not have any sort of communication prior to with that particular poster planning to highlight their services. good point Joe will have to see if I can see that kind of behavior..

There is a lot of immoral and unsavory behavior out there.

After dealing with this situation for quite some time I started studying scams, frauds then human behavior then cults.

While I can't prove this definitively, the posting behavior strongly suggests this isn't coming from a typical satisfied customer.What's interesting is how this latest post is carefully crafted to rank well in Google searches for people who are searching for education on land investing.

We need to encourage more of this behavior(sensible investing)

The key lesson is that if you rent to Section 8 tenants, their negative behaviors may result in non-Section 8 tenants to leave.Rent increases are more likely tied to the minimum wage.

Absolutely despicable behavior.