@Laura2592
advantage of hosting larger groups is strictly financial.
A disadvantage is.,. well... anything over 4 guests is chaotic. Group of 5+ young guests is a party even if they don't invite someone else to the property.
We have one big apartment divided into two separate units: Studio for 2 guests + 2 bdr apartment for up to 6 guests so we can host a group of max 8 guests at the time.
The best seller is our 2 bdr apartment with an average of 4 guests at the time.
Second is our studio with an average of 2 guests at the time.
On the third place by the number of bookings is our 3 bdr apartment (both apartments booked by the same group) and the average number of guests was 6.
In 3,5 years we had only one group of 8 guests which is our max capacity.
While it can vary from one destination to another it may give you some perspective.