Amazingly convenient for the Biennale. Ivan is a great host, who met us off the boat, left us towels for swimming and responded very quickly to a request we made.
The kitchen facilities were fine with coffee pods, bread and milk left for us. Having a washing machine was very useful too (we were there in July and, as usual, the heat was a bit fierce).
The area is very quiet, and not at all touristy; San Marco is 15 minutes away, the Giardini section of the Biennale is 5 minutes away. There's a vaporetto (water bus) stop within a couple of minutes walk.
Very recommended.