As with virtually every TV show, the interior layout of the Jefferson's deeluxe apartment in the sky doesn't match the establishing outside shot of the building. The bedrooms would need to be in a perpendicular wing of the building, yet the outside shot is flat. And those bedrooms are likely windowless based on their doorways. Neighbor Mr. Bentley's front door would lead directly into one of the Jefferson's bedrooms.
The Bunker's modest twin house is more realistic, but it's unlikely a twin would have its staircase on the exterior wall instead of the interior common wall. The upstairs bathroom would then be windowless, or perhaps have a skylight. Based on the size of the downstairs, the two bedrooms upstairs would be fairly large. It's not at all unusual that the Jeffersons would have three smaller bedrooms in the same square footage.