Ca'Querini is a fantastic property in a very desirable location in Venice. It is a fully-funtioning Bed & Breakfast outside of AirB&B, so it runs more like a business than someone's home, but other than the extra city tax collected at check in, it was exactly as advertised and a wonderful property.
We had a complete apartment to ourselves with breakfast items available, a clean bathroom, plus a kitchen for making coffee/tea or actually doing some cooking if you want. In Venice, it seems like you would have to pay much more for that, but it was very reasonable as compared with any hotel we looked at, including 1 star hotels.
I highly recommend this place for a beautiful, clean, and thrifty accommodation in Venice!