I don't think there is much you can hold the old owner too. the proper way to handle this would have been to request the house be delivered vacant and then refuse to close until its vacant. you accepted the house under the condition it was, which was one room rented out. you now have a tenant that is refusing to pay rent. you will have to lawyer up and evict.

During your learning career, what are some tips and tricks you've picked up that you don't think are mainstream?

If you use QBO, you can apply for a merchant account and accept online payment.

The biggest ones that will accept non-affiliated sponsors are CrowdStreet and RealCrowd.

Would you accept her if you are looking for a tenant (behavior wise) because it ends there if you wouldn't , she has to find someplace else. 

By sending this way you fulfill the Requirements for Notification regardless of whether people accept the Notification, don't send the Notification back, etc. 

And if he's soured on the idea, he can stop accepting pets.

So a private landlord that chooses to accept Section 8 will receive a portion (or in some cases all) of the rent from the government.  

There are hedge funds that accept smaller investment minimums but I am a bit skeptical of them.All of this is of course in addition to regular old investments like mutual funds.

I definitely would have declined an application with that many tenants, but now they are accepting a rent increase which is pure profit on top of an already cash flowing property.