I had a very nice stay at Liz & Albert's apartment for 3 weeks. As others have noted, it is very centrally located, close to multiple metro lines and within walking distance of many different neighborhoods. The bed was very comfortable and we also used the futon. The kitchen has everything you need to cook things you buy from rue Montorgueil and there's even a little dishwasher. Breffni, who manages the apartment, was terrific and Liz was very responsive.