
Here's one of the hitherto unseen attic bedrooms in 2006. Which one (at that time there were three, including the former studio) is guessable thanks to Joe's video, which shows traces of the '06 decor still in place amid the renovation, including a tell-tale splash of red in the window alcove nearest the old studio room:

Compare the Lennon-era layout. Note that the wall dividing the windows (and rooms) had been demolished by the time Joe got there:

Inarreshtingly, the Beatles Book labelled the pic of John in the mirror as being from the room next to the studio; taking them at their word, that would mean (to state the numbingly obvious) this very location. And there does seem to be a fit: note the windowsill, and that angled "joist" (or whatever it is) - an exact match:

Outside, the view corresponds with a small bit of the other attic alcove, and the more substantial guest bedroom roof:

So another Kenwood location nailed. There he did squat. Try to contain yourself. Etc.
(Incidentally, this was also the location of the blue window (see posts passim), and that's not it in the mirror shot, which means it must have been installed post-June 29, 1967. Try further to contain yourself.)(AND FAIL, HUMAN.)