text: Okay, the streets in this area are now properly marked (those are "setts", because OSM’s "cobblestones" are meant for very ancient Middle Age-style paving).
  Indeed, sometimes we could use surface:sidewalk=* when the type of surface differs from the main carriageway.
  I am closing this note, because it’s more like a generic requirement—and OSM is precisely about improving the map all the time—than a specific point for this street.