My girlfriend and I enjoyed our stay in Pierre's apartment. It is centrally located in the St. Germain area of Paris, located on a bustling street full of restaurants and shops. It is also walking distance to the Louvre, Notre Dame, and many of Paris' best sites. Note, the apartment is small and lacks natural sunlight, but this is Paris and that's how it goes.
My only complaint, which honestly was out of Pierre's hand, was the construction and painting going on in the apartment building. It just so happened that the painter's were right outside our door during our stay, which was noisy, smelly, and generally uncomfortable. I assume that will be done with soon, and in that case, this apartment is honestly great!