Ideal Diary Room?
 

Mine would be a chair like BB7/BB9 but much more over the top xD

What about yours?

The entire room is a chair.

All the walls and floors are fluffy but moreso where the chair normally would be and you can just kind of sit into it and melt away. Caters for all amounts of people/amounts of weird poses and hijinx etc.

A big cube chair which could fit more than one person on easily built into the room kind of.

The chair either to be built into the back wall and have it being a secret revolving door for a twist (like those bookcases in scooby doo) or have it on a pneumatic lift and somehow it either reveal a secret underground room/passage or lift up and the person be evicted as a surprise there would have to be a door on the ceiling then.

A big hand