Conveniently close to the train station (i.e. you don't have to haul your luggage all over town or on a water taxi/bus. ) and it's really nice. Despite being adjacent from a cathedral and right on a main walkway around the island, it's very quiet. Super clean, marble floors, everything was/is exactly as in the pictures. There is no formal 'sitting room' but given the size of Venice, i'm sure this is quite normal. Very much like being in a hotel, but a 3 bedroom hotel with a full kitchen. Very easy access to everything, we really appreciated the location.
We had 4 adults and 2 children and we had everything we needed inside the apartment. Excellent place to stay.