Nina wasn't around but provided great directions and we were met by Joy who was very friendly and helpful and showed us round the apartment. The apartment is compact but absolutely fine for four, with all the amenities we needed, and comfortable beds.
The location is great - so central, we walked to most places we wanted to get to; and the area is bustling and lively, with lots of small shops, bars, places to eat etc.
Nina's apartment was the ideal base for a great short holiday in Paris.