Suzel's appartment is truly wonderful! I've stayed in a lot of places and neighborhoods in Paris, and this is definitely at the top of the list- great quality, great vibe, great location, great host! Highly recommended!
The location is spectacular: walk to the Louvre, Petit Palais, Centre Pompidou, le Marais, Rue Montorgueil, St Germain...I even walked up to the department stores on Hausmann one morning. Two metro stops are steps away from the apartment door. But the apartment isn't loud because it's on a little side street leading to the parking under Les Halles. Tons of great cafes in the area, including the mostly pedestrian Rue Montorgueil where you can sit an have breakfast without feeling like you're sitting next to traffic. There are multiple fantastic boulangeries within steps of the front door- including Suzel's favorite right next door where we got our morning croissant, and sandwich snacks. It's delightful to take a pastry and sit in the sunny square across from the church (St. Eustache) and people watch and Parisians stream across Les Halles. There is also great shopping in the area- some of the finest (but also affordable) clothes, food, kitchenware, etc.
The apartment itself is also perfect: in a classic French apartment building, complete with perfectly worn wide wooden circular stairway leading up to her door (there's also an elevator that's easy to use). The apartment has beautiful (and beautifully creaky) parquet floors, and was sparklingly clean. The main bedroom is perched in a romantic corner room overlooking a quintessentially french neighborhood crossing. The large open kitchen/living room gets incredible light from floor to ceiling windows and is very comfortable, including everything you need to cook at home, or to just chill in the beautiful room relaxing on the couch. Suzel has also done a great job of making the space feel homey and personal, without the personal pictures or other items that can sometimes make you feel uncomfortable when "borrowing" someone's home. The bathroom has gorgeous modern tiling, and great lighting. The shower is roomy and works perfectly, plenty of hot water for all four of us to take showers at some point in the morning or evening. The two extra bedrooms are very comfortable-- simple, stylish and have beautiful windows. The beds and linens were clean and comfortable. The windows are really thick and you hear no street noise when they're closed, nor did we hear any noise from any of the neighboring apartments.
The host: Suzel was really flexible about when we arrived (we had an early morning flight and she was totally open to us arriving at 10am). She was very communicative and was there to greet us with espresso, water, and lots of helpful, friendly, warm information about the apartment and the neighborhood. We felt like we were staying in a friend's home and that she was really happy to have us there- which added to the really warm feeling/vibe of the apartment overall. She touched base with us once, but was not intrusive. And was very flexible about when we left the apartment and letting us keep our bags there while it was being cleaned.