Chiara's appartment is close to everything you need in Venezia (supermarket, restaurants, Coffee Shop, etc). It is also relatively close to the train station (about 1.8km by foot). You can also chose to take the Vaporetto (Waterbus) which will drop you off at the Rialto stop about 5 minutes walk from Chiara's appartment.
Overall, you can find everything you need around the appartment and you should have everything you require in Chiara's appartment if you want to stay in for lunch or à rainyday. You even have your own view on the Canal inside the appartment.