I would like a home with a low interest rate-so I could rent out and cash flow-which he has. 

Higher cash flow comes in later years as rents in tge market go up and you benefit from your low interest rate.

The Airbnb account they presented as reference had low customer rating.

With rates as high as they are and RTVs this low, I'll probably barely breakeven (if that) if I did standard 80LTV.I like cash flow.

If you're not embarrassed by your offer - it isn't low enough:)

However in the future because  of how these things tend to go, I would not have called insurance or a remediation company, I would have just fixed it immediately before it got too bad then warned the tenant not to do it again (and to be fair to them it’s odd that simply hanging a picture would cause a major plumbing leak, the likelihood of that happening is so low) and moved on.

It is very common to see some seems open up (especially on cheaper made brands) over time.I've also noticed that if a floor has a low spot that is parallel with the planks it can keep the planks from locking fully.

Quote from @Jonathan Greene: The difference is the low bar of entry.

I have seen older posts from others saying they pay as low as $175 per pier.

Thats a low LTV but without knowing or seeing the PFS, Returns and previous P&L its tough but if strong 65% even higher should be workable.