Simone's place is perfectly situated in Venice. It's about a 15 minute walk from San Marco, but only a few minutes from some other great piazzas, sights, and nightlife. The bed was about average for an AirBnb - definitely not the worst I've ever stayed on.
Check-in was super easy, and we were allowed to leave our bags in the apartment past check-out while we waited for our train, which was very helpful.