First things first, great location! Les Batignolles is a super hip neighborhood and the apartment is in a secure building, less than 5-10 minutes' walk to several different metro stations and bus stops
The building also has an elevator to the 5th floor (the little studio you stay in is on the 6th floor), so you'll only have one flight of (winding) stairs to deal with, great to know if you have suitcases.
Odile made a point of being there when I arrived and she showed me the apartment. She lives in the building so she is accessible if you need her.
One con is that there was a weird smell coming from the shower -- she gave me some drain cleaner but the smell lingered.
Overall, I would definitely recommend this place. Perfect for solo travelers, and a couple could fit too, but it would be a bit tight. Great location, great price, safe, lots of restaurants and shops nearby. Merci, Odile!