It seems SE sees apartments as Housing

[Toutatis]

. Use of the word "mansion" should be removed as well, because let's be real nobody's getting one of those.

The French version doesn’t say mansion, it says “house”. “Maison” is “house”, not “mansion” though the term is generic enough to include a mansion or a small house but not an apartment. Whoever translated the advertisement from French made a mistake.

This is the rare moment where the English translation being vague and radically different from every other version actually works in its favor a little bit. You can't define a "little slice of Eorzea," so fans have less room to be upset when the house they expected to own never comes to fruition.

They still just show a house on the picture and to me the expression is directly derived from “a slice of land” which refers to a of a piece of land in Eorzea. It’s not an expression one would use to refer to an apartment.