Andrea's apartment was lovely and he was a great and very helpful host. The flat is well suited for larger groups, although we probably took it to the max with 8 people (I would recommend to only use the bedroom and the mezzanine, but maybe not the beds in the living room, so 5 people max for a bit more privacy unless you're a close group). It has a big sitting area, a large kitchen (which has everything you need to be able to cook) and terrace, so the group could spread out and we had enough gathering space, but also space to retreat. It is located beautifully near SS Giovanni & Paolo, really easy to reach from the airport and easy to get around town.
I can recommend it and would love to go back one day.