I’d recommend doing the work to see and learn about the property first then justify the offer based on the location, condition, comparable recent sales etc. so that your offer makes logical sense within the context of the market and has a chance of being accepted.

Try to ask each firm the same questions so you can compare apples-to-apples with answers.

It is really hard to compare apples to apples here because seller financing allows you to do more or less whatever terms you and the seller agree to, that could be amortizing over 30 years or it could be interest only over 3 with a balloon at the end, so you can propose different structures to get you where you need to go.

But you can determine what rental demand and vacancy time is by looking online at what is available to rent in your market - that is comparable to yours. 

Even those who hire a cleaning person are not going to pay twice as much for a new COVID protocol.I am not sure I would compare it to the Soviet Union.

Having said this, remember that appraised value is based on comparable sales (and more).

You may avoid the taxes if you deposit the funds in an eligible retirement plan (which includes anIRA) within "3 years and a day" of the date of the COVID-19 distribution (note: compare to a 60-day rollover).

Rent adjustment may be a consideration compared to the last lease agreement, but that can be changed over time, a long term tenant is more important than that potential 50 dollar difference per month right now.

I have just researched rentals around the area of the house, and compared it to mine, then asked, what can I do to my rental that will set mine apart and justify it being on the higher end of the rental comps.

If you compare real estate with the stock market on an unleveraged basis, the stock market winds hand down instead of return.