An important point is that if you didn't do the renovation or weren't on site checking frequently as the property was renovated, you never know how good the repairs done were by the seller or previous owners (this requires a good bit of construction knowledge).  

I'll bet there was no locksmith or the tenant locked themselves out of the house.Unless there was a defective lock, I wouldn't pay and even then, why didn't the tenant call you?

Supply Chain DisruptionsConstruction Delays: Global supply chain issues, particularly in construction materials, can delay new developments.

We made a bet: be okay with no (or negative) margins on cleaning and let high quality reviews pay dividends years later.It’s paying off. 

We've been doing it this way in the construction industry for decades.Best way for you to know what's it gonna cost for your projects is get estimates/proposals from licensed contractors.

You wouldn't have to deal with any construction holdbacks / reimbursements which is nice.

If its' long term appreciation (which I'm personally not a fan of betting on) you can look at it as, if you put a small 3.5% down payment using FHA or Fannie Mae, and your property appreciates on average at 3% a year.

At the start they performed PM duties but sub contracted out construction  and brokerage.

I would bet it's worse than that in bigger markets 3.

Your best bet for locating and connecting with this individual is on BiggerPockets or your local REI meet-up.