Having never used AirBnB before, I was a little concerned about how things would work out. However, I was very happy with our accommodations, and Gaelle was a great hostess.
The apartment is beautifully appointed and in a great location, close to the Eiffel Tower, Arc de Triumph, and the Metro. It's right across from a bakery and down the street from many cafes, many of which are great. However, I'd skip the Italian one at the end of the block - expensive and not very good.
I would suggest bringing some earplugs as street noise can be a lot for a light sleeper (but you can also buy them at the pharmacy next store). Also, if you are highly allergic to cats, you may want to check with Gaelle, as there does appear to be a car regularly in the unit.
Overall, though, the apartment and the location far exceeded our expectations, and we would definitely rent the unit again.