We spent a weekend in Venice before our cruise. We found this hotel by chance on Hotelscombined at a great rate. The rate was for the Casa Nova which belongs to the Bauer and is next door. You register in the Bauer and use all of the Bauer facilities so it was an opportunity to enjoy a 5* hotel. You can find the Casa Nova on Tripadvisor under Bauer Casa Nova. Don't confuse this hotel with the Casa Nova which is a 3* hotel close by.
The hotel is a five minute stroll to St. Marks square and next to all of the more expensive shops and restaurants. The water ferry is also a five minute walk (Ferry Number 1 is best) and the hotel is on the canal so a private water taxi can take you to the door. The water ferry is slow but much less expensive.
The bedroom was very spacious and the bathroom had a bath and a very large separate shower. The rooms are a little dark but the size and location far outweighed this negative. Breakfast was taken in the Bauer. We were in Venice the weekend of the major flooding and the water was at mid thigh level outside the hotel. Temporary walkways were in place so it was possible to walk round without waterproof boots, though not all areas were accessible until mid afternoon. Perhaps because of this, breakfast on the Sunday was manic with guests and staff dashing everywhere. Breakfast itself was excellent , with hot and cold options available. Everything returned to normal on the Monday as the water had gone and breakfast was a much more sedate affair.
Transfer to the cruise ship is easiest if you take a private water taxi but it is about €80. However, nothing in Venice is cheap.
I would most definitely stay here again, for the location, size of room, quality of the Bauer hotel and general service.