Will this harm my ability to refinance down the road?

Guess which will cause you less headaches?

And, you can't prove that Tenant #1 is the cause...it's an assumption and one that you don't want to rely on. 

No harm in shooting for the bottom of the price range or even a little under it.

I'd appreciate it if you could give some me more insight into how you create these deals, cause all the deals I've been looking at lately suck.

Buyers have a better understanding of what it is and what it can do.Sellers have a better understanding of how to market the home.Buyers usually know that if it's done right (professionally) then their cause for concerns is pretty small.  

Follow up question: would that level of “drain snaking” cause issues in units below?

With an S Corp, distributions of appreciated property are treated as a sale by the corp causing pro rata recognition at the shareholder level.It's easier to pass through tax losses to LLC members than to S Corp shareholders because of favorable rules relating to the tax bases of LLC ownership interests.This isn't an all-inclusive list but wanted to show you some of the differences.

can cause you a lot of anguish, stress, and other issues. 

It must have been a dump.So basically you listed a really bad property, and not only that, but listed it inaccurately, causing people to get upset and rate you poorly once they booked.