Okay, I think exports from Sweet Home can be made useable pretty easily.  Import the obj into Wings 3D, then select all sharp edges and set them to hard.  Export it again.  This fixes two problems.  First, the exports seem to contain stray vertices (without polygon associations), and running a geometry through Wings automatically removes these.  Second, setting those edges as hard fixes the smoothing issues in Poser.

You won't get UV mapping on any wall surfaces unless you apply a texture within Sweet Home.  Even then, the mapping applied looks like it may not be useful without modification.

The geometry will be constructed of a lot of unconnected planes or boxes, some of which may have visibly overlapped surfaces when rendered in Poser.  The overlapping seems to happen pretty easily, but it also seems to be due to user error when creating the walls in Sweet Home.  Based on sample images on their home page, it looks like at least some software can do really nice things with the files exported from Sweet Home, but it looks like that may take a bit of work, with Poser.

This program could be useful as a quick way to generate simple or basic room interiors, or to help create a starting point for a better project built using more sophisticated 3D software.  It's not bad for freeware.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.