First off I must say I don't think the photos do this place justice. It's such a beautiful home. Very welcoming, comfortable and clean, quiet, bright. Also Bigger than it looks in the photos.
Anh and Joel left us a hand-written note, snacks and refreshments (so tasty!), neighborhood restaurants, and instructions for the place. Joel met us there to let us in and explain things as well.
The location is wonderful; Marais is a nice neighborhood worth seeing on its own, but it's also a short walk from the metro stations to get you anywhere you want to go.
The building door uses a code, but the actual flat requires a physical key, so if you're a couple/group who likes to do things on their own and return at different times, you'll have to coordinate with each other (we didn't ask about multiple keys).
If you're staying during the work being done on the front of the building and worried about noise/view/etc. I'd say don't worry, definitely book. The noise was minimal and never lasted long, nor did it start very early. You will miss some of outside light, but the view you can get mostly by just walking out to the front of the building!
Really loved staying here; thanks so much!