The location is super ideal (its near a ton of museums e.g. right next to the Picasso Museum) and there are grocery stores nearby. We had to walk about 10 minutes to get to bus or metro stops to visit other locations (Eiffel Tower, Louve, ect) and we walked to Notre Dame since that was more like a 15m walk.
One thing to note is that it is a studio so it can be a bit tight (the loft bed is very close to the ceiling so if you are claustrophobic you should sleep on the sofa bed). It was only two of us so we only used the sofa bed and it was very comfortable. I am a bit claustrophobic and I couldn't imagine being in there with four adults. A big pro about the place is the washing machine (allows me to pack less). There is no dryer but there are strings and clothes pin in the bathroom where I was able to dry my clothes (it took about a day but that was fine!).
Jacques is a wonderful host. He is SUPER nice and although his English isn't the best, he made every effort to ensure we understood everything. He said it was OK to drop off our luggage early but since the previous guests actually checked out early, we were able to just check in early! We had a late flight out, and Jacques allowed us to leave our luggage in the apartment after checkout while he cleaned it and up until the new guest arrived. Super nice I say!