whereas her home interior looks rather like a studio set (screenshot).
But have a look at the small thumb left beneath:
I just found that house to let (in 2015) with its significant shaped
and untypical huge basement kitchen, as a similar open stair site -
that room really could have been part of an xtreme Sixtie`s styled
two-storey`s loft (besides, the protagonists went regulary downstairs
from ground level entrance, as Steed is just doing above)!