This apartment is in a great spot to walk to the Opera, Galleries of Lafayette and of course tons of cafes and bistros. There is a subway stop just across the street and another major station within 5-8 minutes walk.
We walked to the Louvre (about 15 minutes) and Notre Dame (about 25-30 minutes).
There is only one toilet, its a half bath setup off the kitchen. The bedroom is common to the living room and a bathroom/laiundry room with a shower (also directly off the kitchen. If its not clear in the listing, the second bedroom is up a narrow, steep stairway off the kitchen.
Overall this was a good spot for our family of four (two adult children) but we would've preferred a second toilet at a minimum.
Entry to the building is very secure and well lit. There is a elevator but its typical for Paris buildings like this and only room for one or two max. We used the spiral stairs, this apartment is on the 2nd floor (third for us Americans).