It is super easy to use, you customize the numbers as you need (cost, DP, interest, amortization, taxes, insurance, HOA, etc), and it is spot on. 

I have considered this as well, again, I just don't know if these numbers are fantasy made up on the spot or if they're real, and if they are, how do I go about finding them for the properties I am looking at?

How to spot good properties from bad, when to buy or when to sell, methods and techniques for renovations and repairs, and more are all necessary things to learn about if you want to invest successfully.

We're in a really tight spot financially (thus the decision to sell and rent for the next few years), and I wanted to see:  would you be willing to list our house pro-bono if we signed a 3 year lease with a 10% increase after the 2nd year?"

This is why I prefer to walk through the unit with the tenant and if possible settle things in writing on the spot.

I started w SFRs then moved to a 4 plex and bought a MHP w 23 spots last month.

Even if there are few stains or worn spots, the natural hard woods are the cheapest to do and so I save money over the long run. 

There is a good deal on a short sale in a localish large (300+ units) summer only rental spot.

However the evidence of some marks and the previous owner having used some kind of water blocking paint on some of the walls and the resultant efflorescence at particular spots concerns me.I had a few waterproofing companies come in to assess the situation.

You are in the best spot here at BP!