This is easily the most favorable financing both from an upfront and monthly cost standpoint, and generally you don't have to have received your first paycheck prior to closing. 

If they are professional, they can explain this quickly and easily.

Upon a walkthrough the major things that stood out to me are: roof is near the end of its life, the ac unit, water heater, and a section of cast iron main sewer line (easily accessible overhead in basement) all need to be replaced. 

I do believe that the market is going to cool off quite a bit in the coming months, this is my personal thought granted it may not be true. 2. 1 Bed vs 3 Bed; I could easily afford a 1 bed condo and purchase any furnishings.

Easily last renovated 30 years ago on average.

No one ever explains how to easily estimate what a property is worth by finding what a vacant lot in that area is worth and adding on the New Construction Cost of a house with the same Square Footage.

For future deals, how would y'all recommend minimizing, or eliminating, that pesky 20% down payment and closing/realtor fees? 

This eliminates the need to prove to the agent that you have private funding.

I need something that integrates easily with my social media marketing and IDX.

If they are professional, they can explain this quickly and easily.