The only thing that really scares me are limestone foundations as you would need to replace large sections of walls.

Remodeled kitchen and replaced carpet with LVP (luxury vinyl plank).

Thought I could've gotten a bit more but needed the property rented. 1 thing to note that I learned is we shouldn't have cut costs on tub replacement, Should've just bit the bullet.

You can also try replacing the gaskets if the unit is less than 2-3 years old.

Many times the furniture will be good enough to get you started, but you may want to replace/update old furnishings to stay competitive. 

So I was initially going to sell my house but the buyer backed out due to roof needing replaced and didn't want to negotiate... that being said I am thinking about refinancing it instead to lower the payment and get rid of PMI so I can cash flow the property and hold onto it.

I'd get my money out and replace it with a conventional loan, and cash out the owner as fast as possible if you decide to hold. 

I just replaced a heat pump where the duct was already run and it took about 7 hours. 

I've seen the bad side (although that was 2010-12 or so, so I am old and biased) when inspections was a PITA and at least once cost me more in collective 'inspections fees' than the water tank replacement. 

Debating whether it would be worth it to replace the 4 car driveway for a duplex I'm getting a cash out refi on soon.