I think you will struggle to find an Airbnb rental in Hong Kong.
The city has put in place very stringent regulations for less than one month rentals and serious penalties for property owners who fail to abide by these rules. This has resulted in very few listings on the Airbnb site.
I would suggest you look at a serviced apartment - some of them will do short term rentals... just submit a request here with your dates https://hongkong.asiaxpat.com/serviced-apartments/