I would assume there are some people on here who have gone down the path of developing affordable housing projects for their respective markets. 

Put 10% down on a 650k sale price.

In my (one time) experience with section 8 I put my emphasis on my perception of the applicant's personality, work ethic and credit score.

I'm mainly focusing on Old Town, but would be open to Del Ray or Potomac Yards.  

I still did a paper lease and other forms and the tenant was asking if they could pay online.

I am currently doing airbnb on my current home.

It really depends on what your goals are. 

I have a duplex near a Mini Mart gas station and people are constantly throwing their trash on my property.

Trying to save costs on affordable contractor just cost me more money.Even though I had talked to my real estate agent about how I was investing and trying to rapidly move forward with this home.

Here's a detailed guide on how to screen applicants: Application Screening Guide