Everything from handing over the key till check out worked out fine. The apartment is small but very nice and is equipped with everything you need for a pleasant stay. The location is superb. There is a metro station just a few steps away but you will hardly use it as you can easily reach the main attractions by foot.
For my sister and mom who joined me to Lyon it was the first time they used Airbnb. And they would definitely do it again. I guess that says all... :-)