It's a small place, but fantastic location at walking distance from major metro lines and gare du nord. The contact with Sandra went perfect, I arrived late and could find the keys and entrance easily with the provided information. The studio is small (it's Paris...) but very quiet (not at the street side) and clean.
The bathroom might not be suitable for bigger/taller people. Good internet connection, all you need for a stay in Paris (where you spend most of the day outside anyway. I'll certainly come back!