I stayed at Nolwenns place for a week-long trip. The apartment is super centrally located and very convenient with multiple metro stops nearby. It's a 10 minute walk from the Louvre and many other attractions and restaurants. The apartment is clean, very spacious and equipped with anything you might need (microwave, washing machine, etc).
Nolwenn and Theo are excellent hosts who went above and beyond to make us feel comfortable and are great at communicating. We loved our stay in Paris and I couldn't have asked for a better experience.