Victory Mansions is an apartment complex located in Oceania, a fictional city found in George Orwell's novel 1984. It is located on Airstrip One in London, and at one time the place deserved its name. With a name like Victory Mansions--containing both victory and mansion--readers might expect it to be a wonderful place. Instead, it is a run-down, smelly place.
The building is dirty and "the hallway smelt of boiled cabbage and old rag mats." Things that break do not get fixed, which makes things grow progressively worse. Windows are broken and the heat and plumbing are not in the least reliable. As bad as the building itself, the area around the building is covered with Big Brother propaganda and telecreens.
In other words, think of everything a place called Victory Mansions should be, and it is the opposite of that. Orwell modeled this building after one on which he and his wife lived for a time.