We had an excellent experience at Casa dei Frari. The apartment itself is clean, spacious and well-decorated (there were four of us including two kids). Centrally located in the relatively quiet San Polo sestiere/neighborhood, you can walk to all of the major attractions including St Mark's or the train station in 20 minutes or less. There are many shops and restaurants in the immediate area around the apartment if you want to grab an espresso and pastry on the go in the morning. Last but not least, Niccolo was extremely friendly and helpful. He met us at the beginning and gave us several insider tips for Venice. Cannot wait to go back and we will definitely stay at Casa dei Frari again!