Antonio wasn't there to greet us, it was his friend Daniella instead. She gave us the key to the apartment and offered her help if we had any trouble -she lives in the same building- !
The apartment was both calm and well located (only 10 minutes to San Marco by boat). It was clean, big, had a kitchen, washing machine (we didn't use it after all) and had a nice view over Venice's coast. Antonio was always there to answer my questions by online messages.
It's the perfect place if you want to visit Venice without the hassle of staying in noisy, crowded areas. Giudecca has all the convenience (except cheaper) such as restaurants, grocery stores...

I would definitly recommend staying in Antonio's apartment. :)