So here is the bathroom with the tile laid. The shower still lacks its glass enclosure, but I am quite happy with the way the layout looks.
And here are the niches, painted in my preferred color—rosy taupe. I think it came out great.
There will be a rosy gray sofa in the niche in the living room, along with elegant Art Deco sconces. And my Art Deco mirror from my apartment in New York, if I can figure out how to get it here.