Very nice place, beautifully located. The sofa bed is comfortable enough, but I think it would be best for kids, rather than adults. The apartment is closed to Piazza S Marcos and the Rialto bridge, main attractions of Venice. The living room has windows facing the river m, so you can see the gondolas go by and from time to time you will get a gondola or two who hire singers, so you can open the Windows and Eloy the serenade.
The place offers very basic amenities, so I recommend to buy/bring your own cleaning supplies (sponges), soap, shampoo etc.
The communication was very reliable, Sebastiano and Simone were both very responsive.