Did this in one of ours and been fine ever since

That could only have been for approval and you may be fine if you make the payments, but it's something you would want to check on.

A cost segregation study was done and looked just fine.

I was doing fine until I decided to go for a more expensive neighborhood and price range.

Would just remind them that they will be fined if another tenant complains and they will be held responsible for any costs to treat smoke damage when they move out.

Real estate is often described as a 3 legged stool... with cash flow, appreciation, and mortgage pay-down all acting as legs that let you build your wealth.Plenty of people will say, equity plays are fine... and they can be.... but they come with higher risks than a property that cash-flows where you have extra income every month to help pay the bills.  

When I went down till then there was no water and I just realized that sump pump in corner wouldn’t run without electricity and there was no battery but I assumed that electricity will be back and it will be fine but within half an hour before I left basement water started overflowing from sump pump.

If there's good job growth and low vacancy, you should (probably) be fine.

Be sure to read the fine print very carefully

But would it be fine if I Iabeled myself as the listing owner and made the other person the host?