The first thing I should say is that this place is somebody's home, not a full-time rental unit. So act accordingly.
This apartment was exactly as described: A well appointed flat with a lift and good beds. Internet quite fast with some outages. There's a nice TV, news channels 340-350, some in English. My kids watched a lot of youtube. There is only one potty, no sink, so you have to change rooms to wash your hands. Not so great if you are ultrahygienic. The kitchen has an induction stovetop, common in France but rare in the USA. These stovetops are by far the best way to cook stuff. They provide an unprecedented level of heat control. Maybe I'm overenthusiastic about this but I just love these stoves.
There is a washing machine, but it's not very big, no drier, so we ended up taking our mountains of laundry to two laundromats, each about three blocks distant.
While the Montmarte is not far away, just a short walk (uphill), the location is more accurately described as in the Pigalle district which is historically perhaps regarded with some notoriety. Well forget about that nonsense. While the area still does contain a number of sex shops and the like, everybody just ignores them. We found this section of the city to be bursting with life, especially at night. So many splendid little cafes and restaurants with ample outdoor seating, and fully occupied in the evening with good-natured people of all walks of life carrying on in that inimitable style so characteristic of the French. At least during our stay we saw no organized political activity by the yellow shirts or anybody else. You can buy just about anything you might need within a 2 block radius. For us that was a few AC adapters. And food. Lots and lots of food and drink.