We enjoyed our stay in Casa Sibilla in the weekend between the 18th and the 21st of July. The house is spacious and comfortable for two people, has free wifi and is as described in the advert. It is located in a fantastic area of Venice, very green and far from the tourist crowd, although being about 15 min walk from San Marco square.
The host, Giuseppe, was very helpful and always available. He even invited to see the fireworks for the "Redentore" celebration with his own family, dining by the canal in one of the best locations to see the fireworks.
Overall, a wonderful experience, will certainly be my choice next time I come to Venice.