We can recommend Mélanie's apartment for a stay in Paris for one or two persons.
It's very clean and on the ground floor. The building and its neighbourhood are very quiet.
It is close to connections for public transport: RER C is at 100 m, and several bus lines, metro lines, and a tram have stops at 5 min walking distance. One bus connects with Gare du Nord in 15-20 minutes.
About 10 supermarkets are within 10-15 minutes walk, and a great "artisan" backer shop is 750 m down the same street.
Mélanie and Pierre are very pleasant and quick responders in case of questions and flexible with check-in or out.
The listing is mostly as described and the sofa bed is comfortable to sleep on. Just one minor point is that the matrass of the double bed has a pit.
We stayed for a month and I could work very well; actually, in both rooms is a working space.