I stayed at the Airbnb for 4 nights. The place is very small but well designed and organized so it works well.
As a solo, female traveller, I felt safe staying there as there is a code + buzzer to get into where the apartment is. Easy self check-in process. Close to some great neighbourhoods a close to the metro. I think it could be very tight for 2 people, but if you are out and about exploring Paris all day, likely to be a non issue. Thanks for a great stay!