We stayed at Sophie's flat 8 nights, and it was lovely. We met with Sophie's mother who lives on the 3rd floor in the building. Sophie left us instructions and also called in later that day and answered all our questions. Sophie speaks excellent English.
The flat is as described and the pictures are accurate. It was very clean and neat. It is quite spacious for a couple - the bedroom is on the second floor so there's plenty of room.
The flat has a lot of light. The only down-point was that we only had hot water for shower in the morning, but not at night.
It's 3 minutes walk from the RER station, which is very convenient for getting around in Paris - only 2 stations to St. Mitchel Notre Dam.
The neighborhood is quiet and there are many Cafe's, bakeries and shops and also a market 3 times a week, which was fun.

The flat is located at the edge of the Latin Quarter by the junction of Blv. Montparnass and Blv. St. Mitchel. If you like walking, it's about 30 minutes walk on the blv. to most main sites (Orssey Museum, Rodin Museum, Nortre Dam, etc.).
We liked our stay there and we recommend!
Thank you Sophie!
Efrat & Or.