I replaced all of the carpet, the pad, then put 3 coats of KILZ on the floor and eventually painted the walls to get the cat smell out. 

"House Hacking" is a different animal from a traditional investment when it comes to calculating "return".  

First of all, I know that having tenants with these types of animals is not the best idea because of the insurance issues, liabilities and in some states illegal.

If that tenant were to leave the cat behind for any reason, you would be responsible to house and take care of that cat (or animal) for the same period of time you'd be responsible to hold a couch.. but you have to properly care for itCost to kennel a cat at our city shelter is 28.00 a day x 30 = $840.00  So hope your deposit covers the expense you would need to cover if they left the cat behind.

So, he applied Zorbit on the stairway overnight and the next day, he applied 2 coats of oil-based kilz original.

4) How many animals?  

I believe it is illegal to turn away or deny people with "Service Animals" or "Companion Pets" for medical reasons.  

Alternative uses that might help persuade the neighbor: dog rescue facility, or another animal rescue facility, storage, parking...In Marin County, California, when the rich neighbors complained about a housing development George Lucas (Star Wars producer) wanted to build, he built low-income housing instead.

I do no animals in my propertiesjust because of that reasonive found you cant have nice things with animals- unless your in the country and have acreage so they stay outside- then there is the digging problemI would change your leases to reflect no animalscat urine is the worst you cannot ever get that smell out without a lot of tear out and workenjoy

I don;t think you can charge more because of the service animal.