My wife, two daughters (18 & 15) and I had an amazing stay in the apartment.
For us the location was excellent. Very close to several Metro lines and within walking distance to some excellent cafes/restaurants/boulangerie etc.
The local area (literally right outside) has an excellent market and we were lucky enough to be in the apartment for Le Food Market.
The apartment is set well back from the street so isn’t noisy.
It is on the third floor with no lift but this wasn’t a problem as a one off to get our suitcases up and back down. Internally, the apartment is split between living upstairs and bedrooms downstairs. The internal staircase is quite narrow especially if you have a suitcase to get down to the bedrooms (and back up again).
If we were coming back to Paris I would definitely look to see if this apartment was free.