Marine's place is located in a really convenient area of the city. It's a few blocks from a lively street full of restaurants and shops that specialise in wine, cheeses, meats, etc., but the street itself is quiet. We stocked up on nice French food and had breakfast in her flat each morning before starting our day.
The shower and internet were both great, by the way. I always worry about these things with Airbnb stays, so I figured I'd just say that for this!
Marine's place is close to excellent public transport links, but it was also easy to walk down to the Notre Dame, or up the Pantheon which is literally 1 minute away.
Marine was really flexible with our checkin and checkout circumstances which I really appreciated, and was quick to reply to all our questions.