Yannick's cozy flat in Le Marais was the perfect place for my husband and I during our trip to Paris. It felt really comfortable, and the view was spectacular. We loved having a washer/dryer in the apartment, and appreciated hot water every time we showered. The neighborhood was great, with grocery stores, metro stations, bakeries, shops, and cafes all within walking distance. Yannick was also super helpful and flexible, and kept in touch before and during our stay.
There are two things that we think have to be noted: 1. The spectacular view is because the flat is at the very top of a sixth floor walkup. That's a total of 104 stair steps (we counted!). My husband and I are both pretty active, plus we live in NYC so we're used to walking everywhere and walkup apartments, but after clocking 6+ miles walking around Paris every day, we were cursing those steps. Something to consider if you're not used to walking around that much. 2. The shower is kind of cramped for taller people. I'm 5'3" and I had no issues. My husband is 5'11" and he definitely had to duck down a little to rinse off at times. This wasn't a deal breaker for us, but could be a pain point for taller folks!