Sorry this is not an answer, but I hope it will be helpful.
I recently had a realtor in Florida tell me it was illegal (or at considered unethical) to market a house in this way.
I personally think that is totally incorrect and I think the person who commented on the fair housing act below is on the right track.
I'm posting this to hopefully get some input from the "experts".
I doubt there is a "checkbox" in the MLS for these kinds of features and that listings are limited to putting this information in the description field.
However I think that, unfortunately, there are a lot of realtors who are hesitant to put those words in the description field for fear of turning off buyers who don't need those features. I think that's wrong and like someone else commented I try to avoid realtors at all cost for these very reasons.
Thanks in advance to anyone who can clarify this point, especially if they can point to specific references in either MLS rules and regulations or any other "official" codes, ordinances, etc.