As many others have shared, I had a bit of difficulty with the passcode entry. Namely, the "code" I'd initially received in the welcome email was just "#####" rather than numbers. Be sure to check this before you arrive to save yourself some frustration. Julie from Luckey was very responsive, however, and once I was issued the code numbers I had no further troubles.
As a solo female traveler, I felt extremely safe and comfortable in the space. It's in the perfect location to experience Paris by foot or any other mode of transportation. I feel very fortunate to have found this place and to have stayed there during my trip!