Send them the lock code in pre-check-in instructions and at time of check-in (because not everyone reads the full message first time round), and automate a "how are you liking the place?"

For specialty programs, these may be required. 

Christopher,Now that Fannie Mae came out with their New primary home loan program you already qualify to buy another home. 

How do you know that a coach isn't someone that just went through a training program?

We had our escrow instructions to title telling them they can record when they can put us in second position.. so we were good there.. that was another title claim I made and got paid off.. turns out the bad guy new when our title company had their recording slot and recorded the deed of trust just ahead of us..

In Bigger Pockets Podcast #82, I talked about my "Tenant Self Management Program." 

What are some of the best accounting software programs that you have found for handling the rental finances?

Instruct the tenant to call 911, not you, when they believe this is happening. 

They proposed higher than market rent, but want to keep 2 people from thee organization volunteers in one room in future.We checked the website of the non-profit organization, their program include several categories, including helping international children to school, housing for the homeless, etc.

In addition to finding good software program that meets your needs, I encourage you to get your "legal ducks in a row": e.g. landlord forms library, educational resources, lease agreement and addenda, and operations practice and procedures and policy manual.