Extremely clean and modern flat, not just by Parisienne standards. All equipment is high end tech(siemens, samsung, sonos etc). All electric sockets and other utilities work perfectly too. Room is quite secluded despite being a stonethrow away from the main areas of Paris, allows quiet nights without fear of random people.
Mezzanine's roof is a little low so when going to bed there is a tendency to bump your head if you're taller than 1.50m. It is a little cramped but ideal for 2 people. Cleaner wasn't too friendly but to me, a minor issue.