Catherine's loft is really in a great spot, central to so much in the Le Marais district. Communication was excellent, checking in and out was a breeze, the loft was spotless and the beds were very comfortable. Having the city-locker so close by was very nice and came in handy.
The photos were very accurate but you will notice it's smaller in person. Two of the bedrooms were more like lofts so there's definitely a lack of privacy if needed. While there's no AC, fans were supplied which helped quite a bit. The biggest issue for us was that the listing states 2 baths, which we assumed meant full. There's only a single toilet in the bathroom with the tub.
Overall this is a very nice place and I would recommend it. I think something with dedicated bedrooms and full bathrooms would have worked better for our group of 4.