Silvia's apartment is in a wonderful, quiet location, particularly for visiting the Biennale. The apartment is pretty, and well appointed. We enjoyed evening glasses of wine and morning coffee on the little balcony.
Via Garibaldi, nearby, has everything you'll need for cooking, drinking, gelato, and people watching.
Be prepared to deal with mosquitos though, because there are no screens. You will want to keep the windows open for the fresh air, so bring repellant and/or netting.