It was odd booking another company's stay through Airbnb - Sonder required me to submit my ID (even though I'd already done that through Airbnb) along with a slightly creepy video selfie while turning your head back and forth. They were careful to make it sound like I was required to download their app, without explicitly saying so. And they changed the code to my room about an hour before check-in. Oh, and they were still cleaning the room for about half an hour after check-in.
But other than that, the stay was simple and nice - the apartment was clean and quiet, there was access to a pool and fitness room, it was right above a grocery store, and in a great location downtown.