Short version:
Your super-genius friend QUERCUS SHOSANNA (Inventor of the no-paradox time machine from a recent thread) has designed and constructed a tesseract house like that in the Bob Heinlein short story “… And He Built A Crooked House”. She assures you that the house has none of the disastrous flaws of the one in the short story, and you have every reason to be confident of her talents and judgment. If you want more details, check the spoiler box:
[spoiler]
Quercus rings you up one day to invite you to lunch at her new house so she can make you a business proposition. She is a lot more sensible than the typical hyper-genius; in Reid Richards’s place, she would have made octtuple sure her starship was properly shielded against radiation no matter how close the commies were to beating her to Alpha Centauri, and she’d have gotten the fuck away from Victor von Doom 30 seconds after meeting him.
You join Quercus on her hovercycle and fly to the house, a cube 30 meters on each side, with multiple entrances on each. The house was built by the construction robots that made Quercus her first fortune, but that is just the tip of the iceberg. The house comprises eight interior compartments each the same dimensions as the exterior shell. Quercus, you see, has replicated the achievement (but not the disaster) of Robert Heinlein’s short story “… And He Built A Crooked House,” designing & constructing the house as a three-dimensional projection of a tesseract, then causing it to extend into a fourth spatial dimension, thus transforming the external shell into the cube you saw from outside. This was done deliberately rather than accidentally as in the Heinlein story, and accomplished via physics, not magic; she even shows you the research used to enable the transformation, though frankly her math & physics are far beyond you. The important thing is that she assures you that the house is entirely stable in all spatial dimensions, something she has verified by living inside it for a year.
Quercus explains all this while giving you a tour of the house, showing off not only the fact that it is much larger than one might expect — on the inside, it is a good mile walk from the front door to the back— but also that the house is full of the amazing automation, entertainment, & power tech that made Quercus her 2nd, 3rd, & 4th fortunes. Living in this house is like living in Buckingham Palace without the guilt over class exploitation.
Which brings us to the business proposition. Quercus needs to demonstrate that a normal person, not involved in the design or construction of this structure, can successfully live in it. The fact that she herself has been doing so for a year doesn’t prove that; with her super-brain, she may be compensating for difficulties of navigation and whatnot unconsciously. Thus she would like you to help her test it out for a while. One of the eight compartments is unfurnished except for the automation freeing residents of housekeeping chores. This compartment, which you will recall is 30 x 30 x 30 meters in dimension, itself has several stories and multiple rooms inside. Quercus will continue to live and work in one of the other compartments, but since it is a good longwalk on the inside from her place to yours, it won’t be like y’all are suddenly becoming roommates. The house is close enough to where you live now so that your current life won’t be disrupted, and she will pay you handsomely for helping her out, as well as covering all utilities. say the word and she will pay to have your furniture shipped to this apartment or just buy new stuff if you prefer.
[/spoiler] 
Would you take Quercus up on this opportunity? Why or why not?