We stayed for three nights. The location is perfect - just outside Old Quebec, but well within a reasonable walking distance (took us maybe 15, 20 minutes max to get to St. John's gate down Rue Saint-Jean). Lots of local restaurants and shops close by for those who don't want to venture far (go to Chez Victor for poutine!).
The unit itself is on the main floor of the house. It was clean and fully stocked - I'm echoing comments here from some of the other reviews, but I've never stayed at an AirBnB before that had so much on offer for guests. Street parking was available, although you have to game the times a little bit during the week. Yves, the host, was super responsive, helpful and just lovely, really. This is a great place to stay in Quebec City.