ZurückHomeWeiter... 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)!