We had a wonderful time at Sébastien’s place!
The neighborhood is absolutely perfect. It's close to the subway and Montmarte is adorable, with tons of great shops and food (plus very close to the Sacre Coeur)!
The place itself was really cute - a kitchen, a comfortable bed, and our friend who slept on the sofa also said it was comfortable.
The doors weren't the best (pretty standard of older, European apartments), so we had to put a heater in front of the bathroom door to close it, but this was really minor. All around, a fantastic value and would 100% recommend!
Sébastien was also very communicative and answered all questions that came up. Snag this place, if you can!