From the Super Mario Wiki
Ashley's Mansion is a haunted mansion located in Diamond City, which is seen in the WarioWare series, first appearing in WarioWare: Touched!. It is seen in every WarioWare game where Ashley appeared. It is a notable location in Ashley's Theme from WarioWare: Touched!
Ashley's Mansion is portrayed as a spooky place, with the interior being decorated with skulls and the illumination done by candles. The house is surrounded by dead trees and constant thundering clouds. Only a single microgame is played inside it.
Ashley's bedroom and the mansion's library are shown for the first time in WarioWare: Smooth Moves, with all microgames taking place inside the latter. Chatty Mr. Spell Book and Monster Flower are newly-revealed residents of the mansion.
The mansion appears only in a black-and-white introduction of the Ashley's stage in WarioWare: D.I.Y.. All microgames take place outside it, among the dead trees.
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