Look up HUD and service animals on the internet. 

@Samantha Miller Maybe you could allow them to stay in the room for free, but maybe they are required to pay for the electrical bill/cable/internet/groceries/etc..

With the advent of the internet and the ease with buying online, the problem has only come more into the light.These neighborhoods often have no buyers. 

Or, you can read up about them on the internet, now that you know there is such a thing.I think it's usually best to create Alabama LLCs if you are holding property in Alabama, but it is not required.

I live in a duplex with tenants on the other side they want to use our internet.

@David Seiler I just found this in the BP forums https://www.biggerpockets.com/forums/79/topics/414833-connected-investors-largest-rei-scam-on-the-internet.  

The ending numbers on this place , I am cash flowing close to $200 ( I will post actual number a year from now)  and  I am also living for free ($500 monthly savings).Mortgage $1850                                      ExpensesRent Unit A                       -$1200                    W/S/G                     -$110Rent Unit B roommates -$1150                   Electricity my side -$150 (estimated)                                                                          Internet                   -  $75=$500 over mortgage

I did quite a lot of digging and mind you; I run a software company so I am relatively savvy at research, and found almost ZERO negative information..which is interesting in the world of the internet where you can find people who will hate on ANYTHING.

The timeshare also will rent out available weeks, you can do it on the internet when the owners do not want to use it. 

Unfortunately, there are a lot of tech companies trying to do your job over the internet.