I live in a city near Silicon Beach of Southern California. My family lives in a 10 unit apartment complex, all 3 bedrooms. It's extremely hard to find apartment complex with all 3 bedrooms in the city.
Anyhow, when we moved in 5 years ago, 3 were occupied by families. One was occupied by a childless couple. Others were occupied by non-families, aka roommates who were splitting the rent.
Many of the roommate based households come and go more frequently, as a roommate moves out due to new job/school.
Families on the other hand don't move as often due to schooling for kids.
Now when the other 2 families and the couple with no children moved out, all were taken over by roommates based household. This was expected as the rent in the area for 3 bed apartment went from around low $2000 (what we paid when we moved) 5+ years ago to mid $3000 now. You can't expect a family with 2 wage earners plus 2 or 3 kids to pay rent of $3000 or above. But with roommates, $1000 per roommate a month seems reasonable, especially if you will be moving out in 2 - 3 years. With Airbnb, it actually makes financial sense for 2 roommate (or even a single guy) to rent a 3 bed apartment and rent extra rooms via Airbnb.
When the new 'roommate' based house holds moved in, I started noticing people with wheeled luggage show up. Guess what? Two roommate household rents a 3 bed apartment, and then they rent out the 3rd bed on Airbnb or something like it. Single guys would have no issue renting out a room via Airbnb. A family with kids renting out a room in a 3bed apartment via Airbnb? Forget about it.
And by renting out the 3rd bed for just $100/night for 10 days, they already break even. If they rent out the 3rd bedroom at $100 a night for 30 days, it's $3000/month. You are actually making money, not losing money. And since this is in California with less than 30 min drive to the beach, the demand is there. It's a great 'business move'.
And the property owner doesn't care as he can rent out a place for $3000+ a month, instead of $2500 a month.
And the end result is, less rental available for families who can afford it.
Interestingly enough, this past year, an elementary school in the neighborhood closed down a kindergarten class because there are less young families with little kids moving it. Not sure it's a chance event, but I'm sure there isn't an endless supply of young couple who can pay $3000/month rent or take on a mortgage of a million or two.
Airbnb definitely does damage to the diversity of big cities, as in makeup of family versus roommate based households.