It's "ordinary" to have some traffic patterns in carpet or light staining but it is not "ordinary" to have animal stains in 15 spots.It takes some time but you should learn quickly what is ordinary and what is not.

They would furnish it, enforce strict rules, and cover issues under $600.I'm curious about increased foot traffic and liabilities—if something major happens to a guest, would I be responsible?

It's currently zoned commercial and in a high traffic area. 

The only allowance they allow is the addition of mother-daughter units where you actually have elderly parents or relatives moving in, and as you guess it, does not cause overcrowding in the local schools, or add much to local traffic, another pet peeve.

However, the exterior seems to be in good shape, it looks like there's good flow of traffic, and the interior looks generally nice, besides having to replace the tile flooring.

I was spending most of my time in traffic, whether it was for work or to drive to the mountains to play.

After he was successful in being more profitable than his neighbours (one thing he's done well with is driving traffic to his direct booking sites to cut out the host sites that take so much in fees) he started taking on investors that put the 20% down for say a DSCR loan.

One moved out, which made the yard less congested.  

With that many cars going past daily, I'm hoping to get a strong list of potential customers just based on the car traffic.

Condition, traffic noise, school district, etc.