This house was the perfect size for our group of 20. The bedrooms were quite spacious, as were the bathrooms. Some of the bathrooms had some issues with the tankless water system, and we couldn't get hot water. Other bathrooms had VERY hot water!
The house was quite lovely, in a very nice area. The outside space was amazing.
If you plan to do a lot of cooking for a large group, you may want to bring some of your own cooking and serving dishes. The kitchen was equipped for the basics (but no pizza cutter), but more limited in larger pots/pans/bowls.