Evaluate if your unit is suitable for shift workers in terms of noise and lighting.

is it still a good time to look into Airbnb or should I wait and see if there is a shift in the economy and travel is impacted. 

From a tax perspective, you won't have as many advantages as you would as a US citizen, or other foreigners, for that matter, but I've been told that the returns still make the investment worthwhile.

To put this into perspective, this was a $420/month increase x 4 months!

There is already evidence of some shifting of the walls as seen in the inspection above.

From a lending perspective, anything property with more than 4 residential units OR has non-residential uses (office, retail, mixed use, etc) is commercial.  

I am wondering from a buyers perspective, it is better to have higher buying price or higher interest?

It sounds like there's a good scope of upside but thinking from a lender perspective and dealing with many investors, I'd recommend you need to work your numbers backwards and see what your upside looks like, based on realistic income and expenses and then go from there. 

But sometimes the sill or edge pieces are gone too, and then the whole house can shift. 

And if you have a totally different perspective, I would love to hear that as well.