If you have only carry-on size luggage, it's very walkable from Gare du Nord. We arrived in the morning and they let us leave our bags until we were ready to check in after dinner. It's a very small hotel but clean and modern. We stayed in a suite with a kitchenette that was fully equipped with china and utensils, pots and pans, a small dishwasher, a refrigerator, a microwave, a small IH cooktop, an electric kettle, and a Nespresso machine. We didn't cook but the microwave and refrigerator were really helpful for our family stay.
There's a Franprix right next to the hotel and a very good boulangerie just a block away that's open early even on Sundays. At least two of the buildings along the street had scaffolding so it's hard to say what kind of neighborhood it was, but it felt normal (not the fanciest but certainly not dangerous).
The Poissonnière metro station (line 7) is less than a minute away. It won't get you to Gare du Nord but it's a good starting point for most tourist attractions. The hotel is also only about a 20-minute walk from Montmartre. It's uphill going there but coming back is all downhill.
The owners were very friendly, helpful, and flexible. It was a little pricey but so are most other hotel rooms that can sleep a family. It was money well spent for a very nice stay. We'd happily choose this hotel again the next time we visit Paris.