Absolutely loved our stay at Sonia's apartment - most favorite was being able to watch the Eiffel sparkles at the top of each hour and the moon right from the balcony. You also wake up to the sun rising right outside the window. There's a ton of light and you can open up the large windows for cool air. The kitchen is well equipped. Centrally connected - Gare de l'Est is a 3 minute walk. and there's a ton of restaurants/supermarkets right around the corner.
Just a heads up that you have to walk up 110 stairs to get to the apartment. And there's no space in the closet of you're coming for a longer stay. The neighborhood could feel slightly unsafe during later parts of the evening, but it's absolutely brilliant during the day.
Sonia was very warm and responsive. She had a cute binder with recommendations and love letters from previous BNB stays, which was really nice to read. I would come back here to stay.