@Marie284, earlier this summer Admiral started offering policies specifically for Airbnb hosts but it is fairly restrictive. You can see a lengthy post I wrote about this here which details the main features and restrictions. The main problem is the 90 day maximum hosting in any year and it must be your main family home. Next year we will need to move to a more expensive guest house policy although this year the Admiral policy has been fine for us.
You have to call them on 0330 33 35 502 (Quote HOST) , you cannot take out this policy online.
Apparently Towergate also offer this but I haven't yet explored the restrictions or features.