Katarina's place is pretty close to a lot of outstanding places like Pantheon, Luxemburg Garden, Notre Dame de Paris, Louvre, Museum of Natural History. I found walking to be easier than trying to navigate the metro system as a walk from the closest station (Port Royal) is about half of a mile or so. Among great conveniences is that the train from CDG (RER B) goes directly to Port Royal. The place is very neat and perfect to spend the day out and come home to catch some zzz in. Katarina was very sweet in making sure we had access to the apartment despite arriving long before the official check in hours. Overall a very pleasant experience staying there.