Before I write a lots of great things about this place, there is something important that you should know: If it's hot out, Genia's place has no air conditioning and is on the top floor, and you will be hot, hot, hot! We arrived in Paris in the midst of a heat wave, and we couldn't even spend time in Genia's flat until after the sun went down since it was so hot. Even then, we profusely sweated through the night.
Genia was very understanding and reimbursed us for the night when we just had to swap out to a place with air conditioning.
If you are in Paris at a time when heat is not an issue, you will really appreciate Genia's place. The location is ideal (a short walk to a great nighttime view of the Eiffel Tower, a neighborhood grocery store, and some cafes), it has a kitchen, and it's quiet. Genia is very responsive to questions though you may never meet her in person.