Our stay at Stephane's place was great. VERY good location to get to anywhere in Paris (by foot or metro, the metro stop is only 1/2 block to the left out of the gate) and to have many eating options and even grocery options.
2nd floor so not a problem at all getting up there with luggage. Yes there may be some street noise at night, but really you cannot get away from this if you want to be in the city. Our kids (8 & 12) were never bothered by the noise enough to affect their sleep. The building with the gate and entry door would make you feel very secure if this would be something you are worried about.
The guest book was perfectly detailed, and with an English section. All appliances worked, and it was so nice to have laundry.
Overall the house was comfortable, well maintained, and stocked well. I would suggest to ask for more body towels if you are traveling group of 4. That was the only thing that was not perfect, everything else was. So far on this trip it was our overall favorite home, even the kids.