Materials are not only a visual choice. They decide how a house sounds, how warm it feels at four in the afternoon in May and how much of your time it will ask for in maintenance.
During a viewing, look closely at the transitions: where floor meets wall, where a window frame meets plaster, where an external wall turns a corner. Careful detailing in those places usually signals care everywhere else.
Ask what is natural, what is treated and what is a veneer. Solid timber, honed stone and lime plaster can be repaired and will acquire a patina. Laminates and painted boards can only be replaced.
Ventilation deserves as much attention as finishes. Cross-ventilated rooms, deep overhangs and shaded glazing are the difference between a house that is comfortable without air conditioning for most of the year and one that is not.
None of this replaces a professional survey. It does help you ask the surveyor better questions.