i'ts an appartement from someone , who lives there. It has been serviced by a company. You have to pick up the key , 15 minutes away from the flat, and return the key there. Which is a bit , i did not like.
Also as it was managed by a external company, they sent out SMS - Email for everything, this was a bit annoying to me. Also you have register you passport online, and they tell you to do this and not to do this.
I belive that's Paris, people don't really trust others, or it's their bad experience.
Nevertheless it's ok if you travel from /to Gare Montparnasse, which is within 15 minutes by Metro and 5 minutes walk.