I have a wood fire and a gas log fire, both are used constantly. I provide all wood (approx 6 cubic metres a season). I would never offer an ethanol fire, because guests might spill flammable liquids and it gives no heat anyway, as it is for decorative purposes only.
On check in, I step by step how to use the fires. Both will be going already, but they have to light them for the next day. I am down the road if they need me. I would NOT be happy for fire useage if I hadn't met them. Many, many guests have never lit a fire in their life, and it is an adventure. Definitely a drawcard for my accommodation.