Mary Nixon

Hello, Airbnb have asked for my N.I number to supply information to HMRC I am retired and have for the past year operated the rent a room scheme which will not exceed the £7,500.00. I fill in an annual self assessment tax return. A couple of Questions. A)Am i correct in that I don't have to declare the amount received? B) How will Airbnb giving HMRC my earnings from my letting effect my Personal tax self assessment? I hope someone can help me please? Thank you