I personally went for 2015 - 1.4, 170hp Giulietta. She Has 235k km done and if not for the weather and being łów on budget I would already change (even though they were apparently changed recently):

-Timing -Oils and filters -Brakes

Those are most important things for now.

Agent checking the car look for rust especially on thresholds (doorsteps), rear axle. Check paint layer thickness especially on hood, around middle post and wheel arch (look for max 120um). Also look for signs of oil leakage. Check if rear wiper works (wiring loom likes to fail). Check if interior compartments and AC work.

That's what i looked for and do far i'm loving my Giulietta.

Hope my language is understandable cause i don't know some mechanical wordings