@Jamie-and-Laura1
Your concern is understandable. You are new, have the entire house for 10 and have instant booking so you are perfect prey for a trash party.
Try to call them by phone and talk to the person who booked and try to know him better.
But, be careful, we recently hosted a group of guys who were very polite and their communication was great before arrival but then they were very bad guests during their stay (loud, disturbed other guests and neighbors, made damages, left a mess...)
Groups of 4+ guests are always challenging, it is not easy to get their attention during the check-in, they forget to close the front door behind them, they are the party for themselves....all in all, they are like kids with ADHD. We could host a group of 8 people but we recently downgraded to max 5 + max 2 (in two units) and thinking about lower it to 4 + 2.
Anyway, you can call Airbnb, say you feel uncomfortable hosting this group and ask ABB to cancel without penalties to you. I would also turn off instant booking option.