All the reviews mentioning a close by bakery are spot on, very convenient. The location in general I found very nice, lots of options within a short walk; lovely. I very much enjoyed my stay in Paris.
As mentioned in the listing's description there are a few stairs to climb, it is a spiral staircase, up to the 3rd floor. The entrance to this staircase is behind a locked door with a keypad. My advice to you: when you are checked in at the apartment, take the time to go down to this door *with the concierge that checks you in* and test the code they give you. We were given the wrong code. This has nothing to do with the host and is not her fault. The door is very modest from the outside, but is marked above with the correct street number, don't doubt you are in the right place ;).
The apartment is the most secure I've ever been in (I am used to North American apartments), the apartment door is like a vault, it has 5 or 6 deadbolts all along the side, entirely steel door, huge steel hinges. I get the impression this is the Paris style, not something that was prompted by the safety of the area (I always felt very safe in Paris, even after dark).
The apartment inside is smaller than the pictures make it appear (not maliciously IMO, just some well positioned pictures using a very wide angle lens). The front door enters into a galley style kitchen, about 10 feet long, then into your main living space/bedroom, which is about 10'x10'. Between is the door to the washroom, represented well in the pictures. It is also not as bright as the pictures make it seem and the finishes are all different: side table, red materials, plants in the nook, table coverings, bedsheets; all different. Nothing is as clean as in the pictures either, but I wouldn't describe the place as dirty; worn, maybe.
The water is heated by a tankless unit. The water pressure in the building in low, especially in the evening. We found the hot water heater would cut in and out (turn off and on) during this time of day resulting in flashes of cold and scalding water (if you are impatient enough to adjust the temperature during the cold periods). We had much more luck in the early mornings with slightly more pressure, still very low though, but serviceable to get clean.
There is a review in January 2019 mentioning the thin curtains in the washroom providing little privacy, this has still not been resolved (we stayed in May 2019). There are other apartment windows in view of the shower.
The window view is into the side of other people's apartments, nothing special. There was no noise from the streets, very quiet in that regard. The steel door does nothing to insulate noise from other apartments or the stairwell though. Luckily there is minimal traffic up and down the stairs, and the neighbours were mostly quiet.
The wifi worked well. The TV is about a 30" unit that I didn't find very useful (no cable, some sort of FreeTV service that was quite lacking); ended up watching a movie on my 14" laptop instead.
Prune herself responded to messages within the same day and was helpful. Most of your stay communication should/will be with the concierge service (currently BnBLord) who were also helpful.