From the Super Mario Wiki
Merlee's Mansion is the home of Merlee in Super Paper Mario. It is the setting of Chapters 2-2, 2-3, and 2-4. Merlee's Mansion is a large manor that lies in the perpetually twilit Gloam Valley. During Chapter 2, Merlee's Mansion was taken over by Mimi, one of Count Bleck's lackeys. The mansion itself has no enemies, though the traps and basement are full of them.
Chapter 2-2: Tricks, Treats, Traps
In the twilit Gloam Valley, Mario discovers Merlee's Mansion. When the plumber reaches the inside of the mansion, he meets a maid, Mimi, who constantly gives Mario wrong information when he asks for the whereabouts of Merlee. The plumber eventually finds a key to a door which allows him to exit the level and go deeper inside the mansion.
As Mario delves deeper into Merlee's Mansion, he comes upon a ? Block with a vase on it. He hits the block, but the vase falls off and breaks. Mimi rushes in and forces Mario to pay her 1,000,000 Rubees as a consequence for breaking the vase. The plumber also discovers some other men who fell for the same trick and are now Mimi's prisoners. He soon learns of a secret Rubee vault hidden away in the attic. With the help of a newly-acquired Pixl, Slim, Mario reaches the vault which has 1,000,000 Rubees and pays off his debt to a shocked Mimi, who explodes out of anger. The plumber now advances further into the mansion, hoping to find Merlee.
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