A charming duplex located a stone's throw from the romantic Notre Dame cathedral, the apartment was nicely furnished and well-equipped. We were well taken care of by Aria and their local point of contact, Christophe, who were warm, helpful and generous throughout our stay (also with a welcome bottle of champagne and pie!)
Just a note to those with huge luggage, children, elderly etc - be ready for lots of stair climbing, which is great since you'll feel progressively fitter (and Paris IS a walking city after all). The apartment is located on the 4th floor in traditional housing with no lifts, and 2 spacious rooms are on the 2nd floor of the apartment up a narrow staircase.
The location, as I mentioned, is super - metres away from the subway station, and in the heart of the city. Please also be aware that the apartment is in the middle of a street full of restaurants and bars - it can get slightly noisy at night, but that's the trade-off for being in the heart of the action.