I had an enjoyable stay in the little but very well organized Lucile's apartement for five nights with my boyfriend. The room is just next to the owners' home; they are very kind and discreet and they even have helped us with our under vacuum-seal bags lending us their vacuum cleaner! The room is very well cleaned and equipped, the neighborhood is quite rough in some little streets at late in the night, so if you are a single lady I recommend not to go out at a late time, but for the rest the apartement is located in a very quiet building, in a safe street.
Just 2 minutes on walk and you reach the metro or 10 minutes for reaching the astonishing Montmartre hill. If you want to save money for your breakfast or whatever, just around the corner, you'll find a very cheap and well equipped Carrefour supermarket. What else? I highly recommend this apartement so..enjoy your stay!