I would compare the return on your rental to your stock market portfolio.

Off Market, and KREIA are just a few places to look. 

Charge market rate.

One year after I used that property to pull a HELOC and this year used that money to purchase an off market 4 family property in Clinton for well under market value, which I just recently finished all of the repairs and upgrades on.

And that number depends on you, your market, your property and your goals.

There are always several good growth markets at any given time.

Quote from @Robel Nessro: How is President Trump going to effect the Real Estate Industry, will it benefit the investors or impact the market and investors?  

There are many markets that this will work great. 

For those who have or had section 8 investments (especially in my market) how would you describe your experience?

@Sean Spagnola - I always like to have photos of recent comps in my back pocket to help with the design of a BRRRR to ensure that the finishes are similar/same to the market.