Great location in central Paris. Close to public transit hub (Les Halles) easily accessible from CDG or Gars du Nord. We slept comfortably (5 of us) in the 4 beds and sofa bed which was already laid out for us.
There is one toilet in the loft and the main bath with the shower is off the main living area. I recommend bringing matches or a room spray to be able to manage smells from the bathroom, including some of the baseline plumbing smell.
Really perfect for a group our size with all we needed, including a bar fridge to store necessities.