Great location! You are literally a block away from the Louvre and the walk to Notre Dame was short and while the 2.2mi walk to the Eiffel Tower was long, it was still manageable. Stayed here in late November and communication was good and checkin was relatively easy. The flat is very secure as you need to access three different doors with locks on them before you get to your flat.
Earlier reviews by guests were accurate in regards to the lack of hot water. Make sure you take showers together in order to take advantage of the hot water!
The place offered a hair dryer which was fantastic since it was rather cold, but the heater did its job. The flat lies on a busy street but that should be no issue for city-dwellers and if you're not used to the noise, it helps to bring ear plugs.
Also, great touch with the disposable slippers!