Sandy's place was great. It was small, but that was made clear up front. It is just a small room and may be a bit cramped for two people plus luggage. I was traveling with a single day pack and had no issues. That said, it was very comfortable hanging out in the living room talking to Sandy who was very pleasant and fun to talk to. I didn't spend much time in the room other than to sleep. Note that Sandy's place is on the fifth floor (as counted by Americans) so be prepared to carry your stuff up 4 flights of steps.
The location is on a narrow downtown Paris street with lots of bars, restaurants and clubs nearby. The Metro station is about 2 blocks away and the Louvre is a 15 minute walk away, "straight" down the road on which Sandy lives. NotreDame is a 20 minute walk away (right next to the Louvre). A great deal for the location and a bargain for the company!