Advise on proper placement of floor threshold
Okay but, you still owe her a dinner &amp; flowers you know. Any gloating will blacklist your butt &amp; mine for years. I have to agree with your red line. As a normal &amp; accepted by family, friends &amp; neighbors practice. The transition should happen only at the room's opening, not some horribly disfigured hallway.

The vinyl is the oddball &amp; is surrounded by parquet, so sorry but the parquet wins 3 to 1, literally. Now, the green isn't bad. But for me, it's in the wrong place. I would've possibly gone for the green if it were pulled back to the other end of the living room's passage way, where the hall &amp; each room had a full threshold surrounding the vinyl. But really, it still wouldn't make sense &amp; the vinyl would be just plain grotesque.