The Cosy apartment was great, is near to 3 metro stations and you can choose which one fits best for you depending in your destination, the location is perfect to explore restaurants and bars with locals, the apartment works perfect for 2 persons, 4 if you are not so Big, everything works fine and is clean and organized, besides of the lots of places to hangout at night the apartment is quiet and easy to access if you drink too much wine, in general if your plans are to explore the city, work or learn about the night life in Paris, The Cosy is a good choice to stay, I definitely stay there again.