We loved the view from the balcony, where we sat every morning to enjoy croissants and pain au chocolate from the boulangerie down the street and cafe americano from the cafe just below. If you stay here, be sure to spend some time checking out the shops right on the block; we befriended a shopkeeper or restaurant manager at every place we visited and they were very keen to answer questions about the neighborhood and offer recommendations!
The apartment was clean, very bright and cheery, and had just enough room for two!
We were there in late June. There is no air conditioning, and the apartment was very comfortable in the morning and at night when we opened all of the French doors. If you are very sensitive to noise, this may pose a problem because it may be too warm to close the windows to quiet the (minimal) street noise. I slept very well, but did notice the sound of neighbors' parties, a couple of loud cars, and weekend chatter as I fell asleep.
We loved being able to walk 25 minutes to Notre Dame, and from there, to walk along the Seine and see all of the major attractions for first-timers in Paris. If you want to be "right in the action" of the tourist attractions, this may not be your spot. But if you want to mix it up with the locals, visit beautiful off-the-beaten-path churches, the Picasso museum and the maison Victor Hugo nearby, and then spend long days strolling/metro-ing to the Notre Dame, Louvre, Champs-Élysées, Eiffel Tower, Arc de Triomphe, then go for Ann's apartment!