We really enjoyed our stay at this apartment. It's in the heart of Le Marais, a lively neighborhood with lots of restaurants and bars and bakeries. We had no safety concerns. Despite all of the action around, the apartment was amazingly quiet. It appears to have a new kitchen that is compact but has everything needed. The location can't be beat - it is one block to the metro station that will quickly take you to the main sites if you don't want to walk. The washer and dryer were super helpful as we were traveling light, and there were written instructions in English for everything in the unit.
Note - the shower is quite small - we'd estimate it at 3 feet by 3 feet. Also, we learned after we arrived there is a regulation in Paris this winter to keep the thermostats at 19c. That's about 66 degrees Fahrenheit so it is a bit chilly in the apartment.
Overall, a great place to stay!