I found it! I found the reddit post, and here is the other picture that was linked. It's apparently a place called Carr Manor in Cripple Creek.
Edit: Here's the site for Carr Manor, not sure which suite it is, though.
Another edit: Found it! Second from the bottom, the Governor Ralph Carr Suite. There's even a third closer angle that confirms there is a door back there, but it doesn't seem possible to isolate it so I can link to just it. Just follow the Carr Manor link above, scroll down to the suite and you'll be able to flip through the photos, but it's basically just the imgur photo taken from the other side of the couch.
As unsexy as I find a bath in the kitchen/diner to begin with, the idea that you’d have to scramble over the counter to get in makes this set up even funnier for some reason!
Is it even a full sized bath? Maybe it's just the perspective but it seems small like you would have to stand in it, although idk maybe that's what they were going for.