We stayed at Pascal's apt near the Opera for a week. We found everything to be of very good quality due to a recent remodel by Pascal. The quality of the space is excellent, and everything functioned well. Very clean, complete, and comfortable. The bed is a real Queen size and folds into the wall when not sleeping. The A/C functioned well, it had a great washer/dryer and complete kitchen.
The location turned out to be very walkable, and close to the bus and Metro stations for several lines. Numerous restaurants, bakeries and grocery stores are within a 10 min walk.
One small drawback was the 3 story climb...it was a minor inconvenience, but if you aren't able to do a lot of stairs, then this is not the place for you.
Overall this was a great introduction to AirBnB. Good communication, friendly and helpful host ( who speaks very good English ) and a very safe and clean space to enjoy your time in Paris.