To start off, you will find the entry into the Airbnb is quite secure, however it is necessary when you understand the neighborhood you are in. Kind of a strange area surrounded by hospitals, and while there are some decent food options I wouldn't be outside late at night if you're not already very comfortable with Paris.
Hopefully you're only traveling solo or as a couple because the 2-bed setup for this apartment was definitely not ideal. The loft bed was very stiff, and with the sofa bed required for the second couple downstairs, there was no extra room for spreading out luggage or just to sit around.
Not that you'll want to spend much time inside the apartment anyway given how humid it was, even with the fan constantly on full blast. Even though Greg told us this was due to the bed linens being taken out of the dryer prematurely before we arrived, we found them to be damp again each evening we came back to the apartment and could not go to bed until running them through the dryer. This also gave a constant humid odor to the apartment upon arrive each and every time.
Back to how small this place was.. the shower literally only has 1 swinging glass panel that barely shields the water from spraying down the entire bathroom. You will certainly still get water all over the toilet while trying to shower, I assure you. Be quick with your showers as well if you're traveling with a group because the hot water lasts only a few minutes before needing to recharge.