If you're trying to tighten everything down to make the numbers work you're probably going to be disappointed with your ROI or you'll be forced to come out of pocket when something unexpected comes up (or you'll be a landlord that gives terrible service because your margins are too tight). 

Just be aware that everybody has tightened their lending restrictions and you may not get the flexibility you want from a small community bank. 

This will tighten the hardwood boards against the subfloor boards.

Banks are tightening up SIGNIFICANTLY at this time.

I did a lot of calling around before I finally decided on the lender I went with for my refi, and all of the lenders I talked to were tightening up their criteria for the "best" rates (i.e. specific loan amounts, LTV's, credit scores, etc).  

What's going to be a strain for you both, personally, is if things get out of hand.

This is something I believe you should not be seeing 15% on unless your lender has been significantly tightening up since COVID. 

With all the demand from consumers wanting to do their personal projects and an unprecedented number of new starts/permits being pulled, the mills were very very strained. 

I've also heard some of the cities in the area are tightening up restrictions on STRs which is definitely a major consideration.

Lending hasn't tightened too much, but there are some new rules post-covid, so you want to make sure your financing looks good before jumping into a search.