We had a great stay at the spacious and comfortable Biennale Apartment which look exactly like on the pictures.
It's close to the main street "Via Garibaldi" and the vaporetto stations Arsenale & Giardini in Castello - away from the tourist trails and the area offers everything you need.
The contact to the optyflat office was very good and helpful.
One day, we had a problem with the heating system which was solved very quickly and didn't disturb our plans - thanks to the optyflat-team!
If you're looking for the authentic Venice - you'll find it here.