this dual level concept is pretty smart.and the huge bathroom is a plus! Definitely needs a large outdoor deck to make up for lack of space on the main level but the fabulous sitting area/fold out sofa is an excellent use of space!
Plant holders make great hair styling supply holders. Instead of hanging plants in them, you just mount them to the wall and put your blow dryer, curling iron and other hair supplies inside 30 Brilliant Bathroom Organization and Storage DIY Solutions
Pillow room: don't spend money on couches or lounge chairs and buy a really nice movie screen. (This would be really fun for movie night, to just move all the living room furniture and bring out the pillows!