Rita's place was just as described.I was at her place for 3 days with my wife and 8 yr son. It is well located, steps away from San Zaccaria vaporetto; very clean and spacious. It can be a bit noisy during the day, not of much consequence to us as we were out in beautiful Venice most of the day.
Agata was excellent with her communication. We ate at restaurants recommended by her and all of them were great.
One suggestion to make the stay even better would be to ensure some tea/coffee/sugar supplies on check-in.
I would strongly recommend this apartment. One tip to get in and out of the apartment from the Airport if you don't have a lot of luggage to carry - use the Ospedale Vaporetto stop rather than San Zaccaria . A 10 min walk will save 30-40 min on the Vaporetto.