The good: The apartment is nicely updated and appeared as pictured. It was very modern. The bedrooms were of a good size with comfortable, clean bedding. The location was wonderful and allowed us to walk to the Louvre and Notre Dame. It was three blocks from a metro stop that got us everywhere else. The apartment sits in a small alley street that was relatively quiet and very quaint. We did not have any trouble finding the key to the door and the alley gate was never locked so we didn't need a code.
The not so good: the musty smell that other travelers mentioned was worse than expected. It permeated through my bag and clothing so the smell persisted for the rest of our trip. There were a lot of ants in the kitchen. If you are travelling with other people, it is worth mentioning that you need to walk through one bedroom to get to the other and there is no usable bathroom downstairs, so a bit less privacy than expected. Lastly, there are three partial bathrooms: a toilet upstairs without a sink, a shower and sink downstairs without a toilet and a toilet and sink downstairs where the toilet is for emergency use only.
All in all, was a lovely place. I probably would choose to stay somewhere new next time in Paris.