(Cashflow, Cash on cash roi, cap rat, 50% rule cash flow etc.)Any advice, criticism and comments is highly appreciated!

It's critical to find a good property manager, RE agent, and General Contractor for a BRRRR.  

:PAs discussed in several other forums or Discussions, the ins co's ARE being more critical now regarding roofs/roofs age.

We asked a price that was higher than any comparable house ever sold in that community with much criticism.

Learning is critical at this early stage!

I've spent decades educating folks to be more critical of disclosing personal / sensitive information, so it would be a little hypocritical - or, in the case of a person's SIN, illegal - to insist otherwise ;-)I would have been a tenant candidate who would not have disclosed his SIN. 

SEVERITY axis will include something like: catastrophic, critical, moderate, negligible.

Add 2 or 3 drywall layers for best results.Read this test (look at test #5)http://www.mjm.qc.ca/publications/en/177881_Floor-CeilingAssemblies.pdfThe most critical mistake that people make is not leaving a 1/8" gap between the new ceiling and the wall.  

Having a “boots on ground” team that you can trust is so critical.

Getting an attorney queued up to review collateral for an expected purchase as well as selecting a servicer in advance of the purchase are critical prerequisites to have in place.