We loved the location in the Northern Marais. It was close to tourist areas but felt more residential. There's a grocery store and organic market within a couple minutes walking distance as well as numerous good restaurants nearby.
The open layout of the place was perfect for our crawling 9-month old. We could watch his every move while cooking or eating but he still had plenty of space to roam. Having an elevator in the building seems to be a rare perk in the neighborhood. Since we were lugging so much baby gear around it was essential. However, be forewarned that the last short flight of stairs would be a challenge for someone with mobility issues. The only area for improvement for the apartment is the mattress in the main bedroom which wasn't as comfortable as we hoped for.
Sebastien's communication was great from the detailed check-in steps to the thorough guest book containing all the apartment information we could think to ask about. We needed some specific items and Sebastien went out of his way to find them and drop them off at the apartment.
Overall we had a great stay!