Paris in a weekend is ambitious but doable.
Day 1
Morning — Café crème in Le Marais, then the Picasso Museum. Afternoon — Walk the Seine to Notre-Dame. Cross to the Latin Quarter for lunch. Evening — Sunset on Pont Neuf, dinner in Saint-Germain.
Day 2
Morning — Montmartre before the crowds. Sacré-Cœur, then the back streets. Afternoon — Musée d'Orsay (skip the Louvre — too big for a weekend). Evening — Apéro on a canal Saint-Martin terrace.