Maud was very helpful and accommodating, and just generally nice.
The area around Stalingrad station and some places nearby felt a bit sketchy at times, though I never felt unsafe (but my wife did).
There's a bakery across the street (closed on Wednesdays, but there are others nearby) for morning croissants and baguettes, and there's a minimarket in the very same house – you can even enter it from the stairwell corridor if you don't want to go out when it's raining.
The communications are really good with 3 lines from Stalingrad stations within short walking distance (~3 min to the nearest entrance, which will get you on the pink line, and ~5 min to the blue line, and something similar for the orange line), and there are bus stops nearby too, we just didn't use them as much. – You can also walk to Gare du Nord in ~20 min (and Gare de l’Est in ~23 min).
There are also several places to eat on the nearby Avenue de Flandre (where the entrance to the pink Metro line is), and a Franprix grocery store. All within 3-10 min walk.
The apartment itself was very well kept. The bed was big enough, there were basic kitchen utensils and fridge and freezer and oven and stove and microwave and most of the things you need – and WiFi with good internet connection. It's a small apartment, but big enough for two to live comfortably, cook, and rest.
And as we mentioned in the beginning – Maud was very welcoming and helpful.