Hello @Sharon2048
If you have the room for it, then I would say that yes this would be something that a lot of guests would appreciate.
There are not many filters for guests to tick on Airbnb when they make a search but there was a recent addition last year which was to be able to search listings that offered king size beds! So yes, go for it!
One thing to bear in mind though Sharon, a king size bed in the US is bigger than a UK or French size King bed so make sure you clearly state the size of the bed on your listing to avoid US guests complaining that it was too small!
All the best
Joëlle