I'll try to be brief :) As a summary, we felt like home even though we were in another city doing tourism.
Checkin and checkout: We could do the check-in before the specified time. It was nice since we took an early morning flight. That way, we were able to settle in early in the morning. Same with the checkout, Siria, the host offered us to take some more time to do the checkout.
Location: I wasn't sure whether the situation was right or not since I didn't know Venice. I have to say that it was perfect: 10 minutes from the bus station (It's ideal if you're coming by plane or train). For me, it is essential to take a short time to get to the airport. Venice is small, so the apartment is near the Rialto bridge and Vapporeto (The bus, via the canal, in Venice).
Amenities: You can think about a lot of details that you would like in the apartment. It's what you're going to get :) Some of them: bath essentials (Towels, shampoo, earplugs), some food available (Beer, eggs, cheese, tiramisu, among other things!), travel guide, restaurant suggestions.