We are a family of four (couple, teenager and kid) and stayed in Mathilde's place a few nights to get to know Paris in the winter. The stay was nice. There are a lot of good places to eat and hangout around the apartment, there is easy access to the Metro and the RER (we bought a Navigo valid for one week and only used public transportation) and the heating and the shower work just fine. Though, there are a few issues you should pay attention to. The first is the strong smell of oil, probably from the kebab place on the ground floor. Then, the Wi-Fi connection is good while working, but very unstable. And the noise from the Place de la Contrescape goes all the way to 2 in the morning, which wasn't an issue for us, but can be if you have difficulty sleeping.