Hi @Simon232,
Yes, be very clear with the guests as to what they'll get - if there's only 1 bedroom for them to use, advertise it as a 1 bed place. That way, only people looking for 1 bedroom will find your place. We thought long and hard about our private spaces, in the end the entire house is available to them, and our private space is just outbuildings, but great tips above, only show photos of what they can access and put the info into the advert (but accept that a number of guests simply won't read those!). We email our house rules again to guests shortly before their arrival, and make sure they understand them. That avoids any difficult conversations after they've checked in. Finally, do make it clear that you will be there during some stays - I only ever book Airbnb stays where I can have the entire place, ie not sharing with hosts, but it's definitely a personal preference....