We went here with 4 people + a dog and it was just what we needed for the time, because we went there during the film festival. First of all, compared with other apartments during the Biennale, the price-performance ratio is very good! I am sure lots of hosts demand way more money for smaller apartments during this peak period in late summer. The location is both close to the Lido but also localised close enough to the main islands, so you can go for a walk to San Marco etc. It has little to no sunshine coming directly into the apartment, so it's good to cool down. The kitchen works fine and the shower is definitely big enough. You should bring some multiconductor plugs, because they are not that many plug sockets, you sometimes need for 4 people. Some of the doors are quite loud, so maybe keep in mind to bring earplugs if you're sensitive to noises.