This apartment is located a bit far from the centre of Paris, but is quite easily accessible by metro. There are bakeries, cafes, and supermarkets (including a reasonably large Monoprix) nearby. It's also quite close to Gare du Nord and Gare de l'Est, which is convenient if you're arriving/departing Paris by train. Note that the area is just a bit seedy, with groups of young people loitering the streets, but we never felt unsafe even when returning late in the evening. The areas can be a bit loud at night/early in the morning - especially if you're sleeping on the couch in the living room. Ear plugs helped tremendously. The apartment is on the 5th floor (counting the ground floor) with no elevator, so if you have difficulty climbing stairs, keep this in mind.
The apartment consists of quite a large kitchen/living room with a pull-out sofa that can comfortably sleep 2 people and a tiny bedroom with a bed that again can sleep 2 people. The kitchen has all the necessary things to cook meals, including a large fridge. Utensils, pots, oils were provided. Perrine was generous enough to leave some food and drinks in the apartment (including beer).
Perrine is a great host and is easy to communicate with. Our questions/enquiries about the apartment were answered quickly. Overall, we found her place to be a great base for spending a week in Paris.