This is a fantastic apartment and we recommend it highly for a stay in Paris.
There are a number of reasons for this recommendation:
Firstly the apartment is in a fantastic location - it's in the heart of the 5th arrondissement, close to the Pantheon, Luxembourg gardens, the metro station, buses and lovely shops, restaurants and bars. There's a convenient organic supermarket across the road. The area has both families, students (it's nearby the Sorbonne and other schools) and professionals. We felt very relaxed walking around at both day and night. It's just a 10 min walk to Ille de la Cite/ Notre Dame.
Secondly the apartment itself is beautiful, very spacious, comfortable and very convenient. It provides a lovely atmosphere to unwind after a day of sightseeing. The kitchen is well equipped (including a Nespresso machine) and the other facilities are top notch. Our group was 2 adults and 2 children (double bed and 2 single beds) and there was plenty of space for everyone. The heating was good for us in winter and we are sure that it would be very comfortable in summer. The only draw back, for someone with mobility difficulties, is that the apartment is on the 4th floor with no lift.
Thirdly, Sylvie and Eric are fantastic hosts. It was always very easy to contact them at any time and they were very helpful in meeting us at the apartment and explaining all the facilities. What's more, they very kindly helped us from being ripped off by an unscrupulous taxi driver after meeting us upon arrival.
Absolutely wonderful place to stay all round. We'll certainly be back!