We are on our third Bunkhouse RV. We had an Itasca Sunstar and an Itasca Sunova. We now have a Tiffin Allegro RED. They all would fit an 'Average Size Adult' but not me. If you are 5-8 or so and 160 or so, OK. Our daughter fits fine at about 5-9/125. The space makes great storage, but take care about over loading.
The Itascas had simple curtains, one on each level, the Tiffin had doors, operative work HAD. I removed them and stored them. Too hot and also difficult to navigate past when open. I installed a curtain rod and bought a pair of drapes.