Guillaume’s home was awesome. It was clean, very well equipped (the balcony is a huuuuge bonus) and easy to locate.
Our room had its own shower/sink (the single toilet is shared). The bed was comfy, and even in the middle of July it wasn’t too much trouble to sleep. There is no AC in the apartment, but that never bothered us much. We had plenty of space and privacy.
The location was awesome, we loved the neighbourhood, and there were plenty of shops/restaurants/markets nearby. We used the metro only one or two times during our stay, as we were able to walk everywhere (30-60 minutes walk to almost every major tourist attraction in the city). There was a lively night life very close, but being on the fifth floor meant the noise was never a concern, even with the windows open.
Guillaume was out of town during our stay, but he was easy to communicate with (he speaks at least French and English) and responded promptly. His friend and business partner, Gabriela, was there for a couple of nights, and she was wonderful. Very kind and accommodating, and she gave us a lot of great tips for Paris. She even cooked for us one night.
Overall, our stay was fantastic, and we would stay there again!