Even for STRs, I prefer to do a more manual and precise comparative analysis than just relying on Airdna. 

(professions where people are most likely to be very thorough and precise)They have a sellers contract written up by a real estate lawyer, is this enough to smoothly go through a transaction?

No one has a crystal ball to give you a precise prediction of where home prices will be in the future, so this is part of the inherent risk you're taking on.

I am still confused and maybe it is less about the P&L and more about calculating the NOI, or more precise what goes into the expense section.

This podcast brings a level of detail and precision to the education process that I’ve not been able to find anywhere elsePassive Investing ShowsPassive Investing from the Left Field with Jim Pfeifer – Jim is a retired financial advisor that made the shift to passive investing in real estate.

Correct me if I'm wrong, or if you have another calculator that is more precise!

I had this happen here in NY (before the new laws in 2019) and my attorney said to send the payment back to them with a note that says "as per the lease, partial payments are not accepted" or whatever.I've beaten this drum before, but this is precisely why you should be offering only M2M leases! 

That's the precise reason why we do this.

Small parks trade at a discount (higher cap rate) to larger properties precisely because so few people want to 'mess' with a small park and that financing is difficult to come by.  

"Entrepreneur" is not better or worse than "Investor", just more precise terminology.The asset could be cars, diamonds, construction materials, or any other commodity held in inventory.