We were 13 people and stayed for 4 nights. We enjoyed the appartement although there were some downsides: most of the dishes weren't really clean when we arrived, one of the beds had a broken leg (but was later exchanged) and we couldn't figure out how to get the oven to start. Nevertheless this place is perfect for big groups and for people who have a hard time keeping the noise down (as there are basically no neighbours around) ;)