When I am traveling, I look for easy access to important places, food and hosts who can add the local recommendations.
Mario and Camille's place is wonderful on all counts. Very close to the Metro and walkable to almost all of Paris' attractions(Louvre and Notre Dame being within 15mins), great restaurants in Marais, and of course they help you with your planning too if you need. A very happy people to casually talk to over a dinner.
Each airbnb experience just gets better and so was this one. If I am in Paris, I'd like to stay here again.