Hello,
I don't know in which geographical area you're doing your market research, but you should also take legislation into account.
For example, in Spain, in some communities, AirBnB is highly regulated and very heavily taxed, which makes it more expensive to go to an AirBnB than to a hotel.
This is also the case in France: we're currently trying to regulate the market. And other European countries are starting to follow suit, as housing has become a living hell.
So, depending on the country (not everyone is concerned), pay attention to the law.
As for the SEO of your future AirBnB, it's very simple: you search the Facebook groups dedicated to tourism in your area and check the requests for accommodation.
Get yourself listed on TripAdvisor, because I'm pretty sure I've seen AirBnB or similar accommodations there.
Still depending on the country: for Spain, on real estate websites, there are a lot of people posting purely seasonal rentals. So, turn to this type of site.
Finally, why not put together a little tourist website to showcase the area where you'll be doing your AirBnB? I'm assuming that you're targeting a tourist clientele and not a business clientele. If that's the case, make people want to come to your area and offer them not a holiday home, but an experience.
Don't hesitate to let me know if I haven't made myself clear.