Any odd increases/decreases in expenses?

Unless you're forcing appreciation some other way.IMO with rising interest rates, house prices will be flat and may even decrease a bit 2 years from now.

You can cancel, you can ask for repairs, you can ask for an outright price decrease or cash put in to escrow so you can do the repairs yourself (although the VA is pickier about this and may not allow closing/fusion without certain repairs.)

On year one it will be similar as CoC but as your tenant pays down your mortgage, your equity increases (which is a good thing) but your Return on Equity will decrease.  

As you move further from the city, costs will decrease.

Just saw this on Trading Economics:"The US unemployment rate decreased to 3.5 percent in September 2019 from 3.7 percent in the previous month and above below market expectations of 3.7 percent.

Just know that it's not requirement nor does it doesn't necessarily increase or decrease your chances of success as an investor.

May not increase your income by much like you said, but could decrease your vacancy % and look nicer in pictures.

While $500/mo is nothing to scoff at, the cost to convert would be $60k+ (or 10 years rent), and I would decrease the resale value by probably 25-30%, which in this neighborhood would mean over $150k in value LOST, by spending $60k.  

I am trying to avoid any unintended consequences . . . for example, may adding an ADU in a fairly upscale gated SFH community decrease the desirability of the house for prospective buyers when I am ready to sell?