Great location, with a couple caveats. You won't find a much better location near the city center; it was steps from the river in the Latin Quarter, near Notre Dame Cathedral. Checkin was easy, the keys were simple and the responses were quick from Joffrey and his staff. We didn't use the kitchen, so can't speak to its quality. Seemed fine though.
Now the negatives: There are 2 bathrooms but it's really 2 half-bathrooms (1 toilet+ 1 shower for the whole unit). Maybe it's just our American assumption that a bathroom will always be a "full bathroom", but the listing (which says "one bathroom, and a separate toilet") could have been clearer.
Secondly, the smell. Upon entry we were greeted by a mildew-smell, which became more pronounced toward the back of the apartment, and in the lower level (which none of us used). My friend shared the back bedroom with me and had trouble sleeping in part from the mildew and its smell. He moved his bed closer to the front door where the air was fresher and less stuffy, but he had to sleep on a chair to do that. I slept fine in my bed, but more sensitive sleepers might be affected.
Finally, the courtyard is inaccessible. Not a big deal, but if you're excited about using it from the listing photos (which feature the courtyard prominently), heads up. Residents from the units above just walk through it to get to the street.
In hindsight, we felt the nightly price was too high for just 2 half-bathrooms and no access to the courtyard. But you are also paying for prime location. If mildew doesn't bother you, and you don't care about having to share one toilet and shower, this could work for you. That said, everything else was good. Joffrey and his team were prompt and polite in helping us check in. If the price were lower and the smell were eliminated, I'd stay here again thanks to the unbeatable location.