These are very small "studettes" located on the higher floors of bourgeois buildings. The name originates from the colloquial term used for a maid - "bonne à tout faire." Once quarters where maids lived, today they are frequently inhabited by students. They are usually walk-ups with shared bathrooms. The advantage of a chambre de bonne is a significantly lower rent.
Important - Students must pay a security deposit and monthly rent directly to landlord in Euros. Housing charges do not appear on e-bill.