Some more thoughts on the layout of Sherlock and John’s flat, because why not?
The first layout only works if you assume both the kitchen and the stairway windows are now interior windows (pink/red being the original house, blue being the add-on), but I think maybe that’s possible? Anyway if the window thing does work, I feel like this makes the most sense, especially for Sherlock’s bedroom.
The middle layout feels increasingly unlikely since Sherlock’s bedroom would have to be the width of a door + a refrigerator, unless the stair window is interior? idk, I feel like even that might be unlikely given how we see Sherlock’s bedroom is oriented in Scandal, plus to jive with Scandal there would have to be another hall..
The third one works if you assume Mrs Hudson knocked out a couple of walls and built some kind of extension between the original building and a second building in the back (Ish mentioned this might be mews?). Bonus for no interior windows, lol.