'At the...' shows an old woman leaning over the balustrade in front of a church portal. Her posture is mirroring the prayer she probably did inside. Or is she simply resting from cleaning duties?
The framing is perfect: the architecture has been incorporated as if it's been made for the picture, framing the darkness that's needed to offset the woman herself. A very symmetrical composition, with a calm lighting; it could have been too symmetrical but the subject herself creates tension by being off-centre amidst all the chiseled perfection, and by her humble, maybe poor human appearance before the architectural splendor.
This is no in-your-face Street and the payload comes from the total absence of interaction with other people. The context makes more than up for this though, creating an interaction of its own by the sheer contrast and tension with the subject.
Anyone is free to draw an interpretation of this - solitude, the human condition, a social or religious comment - but that doesn't make this great picture less appealing and evocative.