However, they installed what I swear was a little tiny kids toilet in my bathroom at first when I ordered an ADA adult sized one, they forgot a recessed 'picture alcove' that was supposed to be in the master bath when framing/drywall, and other small details like that. 

@Ada Guerin-Hughes so far so good.

You need to know and understand Fair Housing, ADA, Lead-Based Paint, and mold issues.

Again I am not a lawyer but my view of the ADA rules is that they do not include ESA animals, cats (or any animal other than dogs and miniature horses) and that most posters have not looked into what ADA states.  

My turn to chime in.Headline of the ad says “Nice Clean 3/1 UPSTAIRS unit in this charming Duplex”First Sentence of the ad and the last two sentences of the ad as well as halfway through the ad it says “No Smokers of any kind, no vaping, no e-cigarettes, no cigars, nothing .

Had you been a real estate agent, picking up some elderly or disable person is actually required under ADA, equal opportunity and access.

Overall they are low in cost, and I believe ad a great return.

I also renew the ad a few times per day as well as have professional photos taken to showcase the property and stand out from most of the competition.

The ADA is not the applicable law for housing.

So, you need to think about zoning and then other things with which you may need to comply as a business (ADA access, restroom capacity, etc).