Haven't had an RV with a fireplace, until we take delivery on our new one soon! At first when we saw them at the RV shows, I thought they were kinda cheesy......but camping with friends & family who have them, and actually enjoying their benefit has changed my mind!
The new 5th wheel we're purchasing has the fireplace mounted beneath the entertainment center, which is on a slide that also houses the outside entertainment center. This setup utilizes space efficiently, IMO! We've used the cube heaters and I found them to be obnoxiously in the way, so I'm excited to have ambiance and heat to enjoy tucked along the wall!