@Terra112 The majority of people have no idea how to build a fire or use it safely. Even if you leave detailed instructions, they often won't read them.
Their knowledge of fireplaces comes from movies, where it all looks so romantic and cozy.
I've read quite a few posts from hosts whose guests filled the house with smoke because they had no idea that there was something called a flue that needed to be opened, even though that was explained in the house manual.
Guests and fire are a very risky mix.
If it's just a studio apt. in your home, or a cabin on the property where you live, where you are close by to physically help them light a fire and on hand if something goes wrong, that's doable, but for an entire house with an off-site host it's not a good idea.