Why they're on the list
Her old-house, 'collected and cozy' positioning and existing before/after post format ('who remembers how ugly this corner used to be') are close to a native fit for Ernesta's core demonstration mechanic, and the warm, lived-in tone should read well to both a time-starved Nester and a discerning Established viewer.
How to brief them
Her existing before/after format can be adapted almost directly — ask for the same 'here's what it used to look like' structure applied to the rug swap.