@Tom888 my guest room is next to my bedroom & I've never had a guest complain about it.
You do state in your listing that the guest room is next to the master so there shouldn't be any surprises for guests. I've had a look at your listing and I would suggest changing the description to be more about the bedroom & the basement that the guest has access to, rather than a description of the whole house. At the moment it reads almost like a whole house listing rather than a private room.
You should also make it clear in the listing what areas of the house the guests have access to. Is it only the bedroom, bathroom & basement. Or can guests use the kitchen, make themselves at home in your living room etc. Most potential guests don't read further than the first couple of paragraphs on a listing so all the important stuff should be in there.
Good luck with it & happy hosting!