My apartment, renovated by an interior designer, is super nice for a weekend in Paris. It is located in the trendy "So-Pi" aka South Pigalle, near Montmartre. It is also very quiet.
You are 5 minutes walk to Montmartre, the Sacré Coeur, the Moulin Rouge and the Rue des Martyrs, deemed to have the best of Paris food shops! You are 10 minutes walk from the department stores and the Paris Opera.
It is also served by several subway lines and buses.