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The Mirror House of Goldvale is a house the PC's bought for the price of one cow, sold to them by the bartender Jack at The Card House. It's a roughly square small one story house with a couple of windows1). Inside it it came unfurnished and according to the bartender it has a history of unexplained vacancies, thus keeps defaulting back to being for sale, with the bartender just sort of the de-facto real estate agent in these parts because The Card House is the central hub of town and the town's leadership isn't clear otherwise to take charge.
Once PCs took ownership they found a backdoor on the inside made entirely of mirror, the handle and hinges even made of it. But no door can be seen from the outside behind the building. Being ballsy and opening the door players discovered a mirror image of their house on the other side, where one enters from the Mirror Door, into the mirror's, Mirror Door. All windows of this secondary mirror house are mirrors and unopenable. The front door however looks normal and can be opened to reveal the void of space and stars! When PCs experimented with this the effect was like oxygen getting sucked out an airlock in any sci-fi, suddenly created air pressure pulling at them before they closed the secondary front door.
They have yet to figure out the mystery of this house beyond that, but quickly turned the normal part of the house into a place to hide and keep their inappropriate “pet” Sunny the Baby Owlbear2).
Of Note
Stashed inside of the mirror room3) between normal house & extra-dimensional space are the Kuo-Toa Idol & a Kuo-Toa Statue. The later came into being after Sunny got into a battle with a half-orc trying to snoop around4). The then idol likely did a lot of healing, maxed out as a 500LBS statue, and budded off a new idol to carry on the Kuo-Toa-fication of the realm.