My friend and I stayed two nights at Alessandro's place and we'd have to say that this was absolutely the best part in our trip. Check-in and check-out time are both flexible. Alessandro is incredibly helpful, welcoming and friendly to us. He picked us up from the water bus stop, helped us with the heavy luggage and provided us with wonderful books about Venice. He recommended us to go to some quiet places where no tourists were so that we could see the true Venice. He also recommended popular local restaurants with reasonable prices.
As for the room , I couldn't think of anything negative to say about. It locates in a quiet neighbourhood but it's also close to the public transport (less than 5 mins walk). Our room looks exactly the same from the picture and it is very clean as the cleaning lady comes everyday. The breakfast was our favourate part! Alessandro offered a range of food and drinks in the morning and we still miss that now.
Anyway, it is just a perfect place to stay in Venice and you will know why I'm saying that when you meet this fantastic host--Alessandro :-) I will definitely stay at his place if I visit Venice agian