Perfect landing pad for a single traveler in Paris! An excellent option to explore the city without spending too much on a hotel. The building itself was very quiet and seemed to be recently renovated.
But to be very clear - you'd have to be creative to fit more than one person. Though it's a small space, there's large window that really opens up the space, so I never really felt claustrophobic.
Convenient to the metro, and a quick ride to the downtown area, but far enough away to escape the tourists. It's in a busy market area so there's always lots of people around. I never had any trouble walking around the neighborhood - and was way more concerned with pickpockets in the touristy areas downtown than anything happening near the apartment.
It is up on the 6th floor (7th for Americans) and the bed is lofted up a small ladder, so be aware if you have mobility concerns.