We stayed at Casa Rezzonico as well, last May, and thoroughly enjoyed it. I've recommended it many times to others. (We had a room with a canal view which we really liked. And the interior garden courtyard is lovely.) I have to say, though, that I'm not sure it's what Kristina is looking for, esp. if she wants a terrace with a view of any kind. Also, the belltower nearby rings fairly loudly four times an hour stopping at 11 pm each night. We found it charming but others, esp. light sleepers, might not.
Here are some photos I took of CR and its surroundings, in case you're interested:
https://flic.kr/s/aHsjTBGc8B
Here's a cut-and-paste of my TripAdvisor review of the place (couldn't get the link to work):
We really loved this place. We requested a room with a view on the little canal that runs down to Campo San Barnaba (made famous as the place where Katherine Hepburn falls into the canal in "Summertime," for those of a certain age). Boy, were we glad we did. Being able to open the window out onto that canal was a highlight of our time in Venice. (Tip: The GROM in Campo San Barnaba makes outstanding gelato.)
The room was spacious and the bath was nice-sized, by Italian standards. Matteo and Mattia (brothers) were extremely helpful during our stay. They helped arrange for a tennis lesson on the Lido and made other reservations and recommendations for us. The lively Campo Santa Margherita is close by but far enough away so it doesn't interfere with sleeping.
There is a nearby bell tower that rings a lot but we found that charming. It stops ringing after 11 pm, if I remember correctly.
The charming garden is great for breakfast, and most of the tables are under a covered area, so no worries if the weather is a little drizzly as was the case for some of the three mornings we were there. They've got a nifty little automatic espresso/coffee machine that's fun to use and makes tasty drinks. We enjoyed the variety of foods available for breakfast, esp. some really tasty pastries.
We will definitely recommend this place to others. It was the most expensive place we stayed, but the rates were definitely comparable to other places in Venice, which is known for being pricey.