@mmdia82 You need to declare and pay income tax on any AirBNB income, and it will be in addition to your normal income so at the marginal rate.
If you rent out a room to someone you can avail of the rent-a-room-scheme, you can rent out up to €14k a year tax free. AirBNB is not included in the rent-a-room-scheme.
Given you will be living in the house, there are pro's and con's to both options, however assuming you are on the marginal rate, you would need to earn an extra €28k a year to make up what you would on the rent-a-room-scheme, but of course it would mean sharing your home.
Note that if you even go €1 over the €14k a year (including bills), you will pay tax on the full amount.