FR Room Rental Paris - Not a landlord

[Lorenzo374]

Hey all, I am doing my 2018 tax declaration and I realized I might need to declare the revenues from my Room Airbnb rental.

We are 2 people renting a flat as a main residence and we occasionally (less than 100 days per year) rent a room when one of us is not in the house for a week end or so. 

Total Earning last year is less than 1k EUR. Do I need to declare it? If yes, anybody knows how? 

Thanks,

Lorenzo