As far as analytical tools, the most commonly used in our area is the AirDNA Rentalizer, I find it is usually about 20% to generous, generally.

Im not applying the NA multifamily investing model but maybe I was being generous calling them incredible.

Taking into account some necessary supplies for installing the new unit (let’s say generously $800), that means their / hr rate was $533.

They all used the same the tactic, money.I would offer a generous buyout, which I know will be hard on principle, but you'll spend just as much on lawyers and preserve your sanity in the long run, wishing you the best of luck.

You could easily carve another bedroom out of the basement and still have a very generous family room. 

That's six months of free rent (thanks to the tax-payers and a government that loves to be generous with other people's money). 

While it is not required, it seems like an easy gesture of goodwill. 

If it was too generous for the buyer and let them out too easily, why did you agree to it?

Having to collect the rent (which is done electronically), deposit it and transfer it each month, shouldn't take more than 30 min in total (being very generous).

The price looks reasonable to me, particularly for a painter that does excellent work.Colors won't affect the appraisal, but the nicer a place looks the more generous the appraiser will be.