I came to Paris for a 5-day vacation with my mom. I would most definitely stay at this location or at any other place Isabelle might have. She was very kind and responsive!
Her apartment was exactly as described. Completely renovated and new, it was a pleasure staying there. It was very clean, more spacious than typical hotels in Paris and at a convenient location. The apartment is also away from tourists but close enough to everything tourists would want to see. We walked everywhere - just a 20-30 minute walk along the Seine to get to the Tuileries and the Louvre, 10 minutes to the Eiffel Tower and a few minutes to Champs-Élyseés. The metro is also conveniently just 5 minutes away.
A few other things:
• The bed is VERY comfortable. We had a good night's sleep every night.
• Shower & Bathroom are quite small, but you still have enough space to move around. Also, note that the toilet itself is separate from the shower/vanity area. But this was also not an issue for us.