Unable to answer "What surface does this road have?" – Rua do Mercado (Residential Road) – https://osm.org/way/369907454 via StreetComplete 58.2:

Like many streets in Castelo de Vide, this street has a paved lane with cut stone cobbles on either side.

Attached photo(s):
https://westnordost.de/p/232750.jpg