This is a lovely studio in a fine part of Paris. Marine is an excellent, considerate host, and all her recommendations of things to do in the neighborhood are great. The Eric Kayser boulangerie near the Maubert-Mutualité metro stop? Awesome. The Panthéon? So cool!
Visit the Latin Quarter, get a metro pass, and pretend to be Parisian for a week chez Marine. Her place is near all sorts of wonderful restaurants (I especially loved la Petite Périgourdine), it's on a well-connected metro line, and the studio itself is very comfortable! It's an extremely well-appointed home; we made breakfast with the eggs and butter Marine left for us in the fridge.
I would recommend this studio to any couple or solo traveler visiting Paris.