Spent 8 days in Paris for €289 total excluding flights. Here's breakdown by arrondissement:

Accommodation: €112 (hostel in Belleville near République, €14/night)

Transport: €29.40 (Navigo weekly pass for all zones)

Food: €98 (Marché Belleville, cooking, cheap restaurants in 11th)

Museums: €35 (museum pass for 4 days covering Louvre, Orsay, Arc de Triomphe)

Misc: €14.60 (laundry, Orange phone top-up)

Key savings: bought groceries at Monoprix République, cooked breakfast in hostel kitchen, lunch from boulangeries around République (€3-4), dinner at student restaurants near Sorbonne or ethnic places in 11th/20th arrondissements. Many museums free first Sunday of month.