The Hush-Hush Room
If you’ve read the story of Anne Frank, you’d know all about the hiding space behind the bookcase. This room is a little something like that but we don’t really know what the purpose of it was. The OP found it in their great aunt’s old house and it is concealed behind a shelf on the wall.
Although the room is simple, it’s also spacious, fully furnished, and has the basics anyone would need to stay there for a bit. We mean, a comfy sofa and books are more than enough to keep us happy. It seems like the ideal spot to spend some alone time.