I feel this way about AirBnB as well.
Minor nitpick on this... it's doubtful that it 'turned into a good experience', as much as "AirBnB was able to compensate, monetarily or otherwise, for the bad experience (which still exists)".
If you use AirBnB to visit NYC once every 3-4 years, its a very different situation than someone coming to clean every 2 weeks.
555-123-1234 would become
"55512
part 2
31234"
I've done this to get around the issue when trying to get in touch with the property owner.