I stayed here for a little over a week as the end-cap to a few weeks of vacation in France to celebrate my 40th birthday.
The place was perfectly as described - clean and tidy with nearly everything I needed for an 8-night stay. Though we mostly ate out at the amazing restaurants and cafes in the neighborhood, we had the option of making a few meals at the apartment which went smoothly with the necessary items in the kitchen.
The apartment is well-located for everything you need - there are TONS of restaurants, cafes, bars, grocery stores, pharmacies, and laundry all within very short walking distance. You're also very well situated to several metro stations, which made traveling throughout the city an absolute breeze. The Louvre is visible from your window and is one block away. Tuileries Garden, Pont Neuf, Notre Dame of Paris...among a million other tourist spots, all super close. Shopping is also readily available, no matter what your budget - whether it's at Forever 21, or Tom Ford and Jimmy Choo, they're all a short walk away.
The building itself is quite safe, with multiple locked doors with required key code access as well as physical keys to access the apartment itself.
Check-in was a little confusing at first, as the building is locked and the expected staff was not outside when I arrived. We were initially placed in the wrong room, but that was easily remedied based on my own availability and schedule and duly compensated with a bottle of champagne and fresh croissants the next morning.
I wouldn't hesitate at all to stay here again.
(And if you DO stay, I highly recommend a stop at the corner restaurant "Le Petit Mâchon" - amazing quenelles and excellent wine suggestions from the waiter (who's name I cannot recall, but who was there every night I walked by). I also had the best sweetbreads of my life a short walk away at "L'Escargot". But I could go on forever about the food in this city. Really, just go and investigate for yourself. You'll be glad you did!)