The apartment and location were wonderful. The communication from the hosts was pretty good. Unfortunately, they sent me the information for the wrong apartment before my arrival, I received the door code and instructions for the apartment above mine, and there was no key in the lock box because people were already renting that one. After calling and sitting in the stairwell a while, I received a call back from the hosts. They were apologetic and very polite and told me the information for the next apartment down, which was meant for me. I noticed though, that the door code he gave me for the original wrong apartment was a pattern, and I was able to guess the code for my apartment quite easily. This wasn’t a problem until later that night when another couple unlocked my lock box and used the key to let themselves in (at this point, I had left the key in the locked box for some reason, I should have just kept it with me). They were supposed to be in the apartment below mine, and their lock code was one number different than mine, but they put it in wrong and accidentally guessed mine correctly. At this point, all the locked boxes were clearly a pattern and I felt uncomfortable with that, so I requested that they come change the code to mine, which they did promptly. The next night, another couple tried to let themselves into my apartment, but luckily I was locked in with the key with me, and I had a unique door code at that point.
The problem seems to be that the floors and doors are all unnumbered which leads to quite a bit of confusion, and the door codes were originally all quite similar.
However, the hosts were willing to help and all problems were resolved in the end. The apartment was so beautiful and such an incredible location! Two blocks from the Louvre! Everything you need within a couple blocks, access to transit, and a short walk to Notre Dame as well as many other wonderful attractions. I highly recommend this place, the only reason I give 4 stars is because the first couple days were quite stressful, and I was already stressed from the many challenges of solo travel. But seriously, outside of those instances, my experience at this Airbnb was stellar, and I would love to come back.