The apartment itself is very modern and cute, and the location is central, however the one thing everyone should know about the location of the apartment is that it is on the one block of Rue Saint-Denis, that has a very active prostitution circuit. There are several women working the streets directly outside of the apartment at all hours, and there were 3 visible alleyway brothels that I could see. It didn't make me and the 4 other girls I was staying with in the apartment feel very comfortable.
This next comment, is a bit out of the owners control, however, I still feel the need to share it. When we checked in at 3pm the apartment had not yet been cleaned after the previous guest(s). No clean towels, no clean linens, trash in the bins, etc. It was really upsetting to walk in to after a long day of travel from the US to Paris. Apparently the cleaner never showed up, and the owners were pretty furious with the cleaner. Eventually someone showed up at 4:30pm to begin cleaning which took over 2 hours. The cleaner also left to go get something to drink and came back 45 mins later. Once he was back the cleaner got in an argument with someone in the hallway (in French, so I couldn't catch the whole thing), but it was pretty heated.
The cleaning situation + the prostitution hot spot really gave us a bad feel on what was meant to be a great trip. I have to be honest to say that once our 2 night stay was over, I was so excited to get out of there and to a new part of town.