Six-Rooms

There I am in a big mansion with six rooms, The first i saw The most beautiful thing, The second is an empty room with only just a window. As for The third, The room was missing a wall as you could see outside freely and hear the noises that came with it, for The fourth there's a lone desk and an unfinished note laying untop of it, this surely raises more questions, coming into the fifth room I'll enter the room to see a painting of someone I know which causes a reaction in me. As for the final room, all I could see was six mirrors each reflecting their respective rooms all looked the same except for....