My husband and I stayed at Martina’s apartment for a few nights in September (it was still quite hot out, so we were glad for air conditioning - in both bedroom and living areas).
The apartment was perfect for our needs, as we were attending the biennale. Very close to the exhibition, maybe only 5 minutes walk to both Giardini and Arsenale. This has the added benefit of keeping you out of the crazy-busy St Marks area, though we walked there twice and it only takes 15 uminutes to reach. The street of Ca’ Martina is airy and lovely, with many small bars and restaurants to enjoy, and somewhat less busy than other areas of Venice.
What absolutely put Martina over the top was when we were late for check in - our plane was rerouted to Milan because of fog, and it took us an extra 6 hours to get into Venice. Martina waited for us, and met us at the Alilaguna stop to show us to the apartment, explain the workings of appliances, and give restaurant recommendations. She speaks very good English and communication was very easy!