This apartment is perfectly located, especially for those transiting to/from the Orly airport or the Montparnasse train station.
Karim's check-in instructions were flawless and easy to follow, and the apartment was exactly as described. I slept so well in the comfortable bed, and it was lovely to have so much space to myself.
The only issue I had was with the front door lock, which opened for me twice, and then the third time it took me 30 minutes and a lot of panicking to get it open. In my experience, the truest sign of a good host is how they handle problems when they arise, and Karim was great - super supportive and apologetic. If I was certain the lock had been fixed/serviced, I would definitely stay there again.