My wife and I arranged a family vacation with our four children (three young adults and one teenager) and three of our kids brought friends. That's a lot of adults and almost adults for one house, but even with 9 people, we never felt we were in each other's way in this gorgeous, spacious property.
With the exception of the bedroom with the bunk beds (on the third level, only enough space just for sleeping), all the other four bedrooms on the second level (street level from the front entrance) were very large, allowing for alone time, if needed. The third floor had AC and each of the second level bedrooms had a ductless wall AC unit, so everyone could sleep at their comfort temperature.
There are multiple large decks, so people could hang out together or in smaller groups, as their mood fit. There is a large table inside and also on one of the decks, so family dinners are comfortable.
The steps to the lake are right out the back door on the lower level and there's tons of privacy for swimming, kayaking, canoeing, or just making Smores on the little beach.
On the one day when it rained all day, most of the kids took advantage of the game room (we brought our PS4) and there were plenty of TVs, so we had no fights over what to watch.
We were about one block from a running/biking trail, so exercise or just getting away on a walk was easy.