Felt like a cool secret Paris hideout. The flat opens up from a small entryway passage into a large central chamber with branches off to the separate bedrooms. The photos don't really portray the feeling accurately. Exposed old stones and sunken floor make it feel like stepping down into a cavern.
Every bedroom and the kitchen requires going up and down some angular concrete steps so keep that in mind if you're planning on bringing luggage or aren't comfortable with narrow French staircases with no railings.
The kitchen was well equipped with plenty of glasses and flatware. And each bedroom had its own en-suite bath or shower. We enjoyed our stay and look forward to visiting Paris again!