@Denise80 Splitting the bookings would allow you to secure the payments, and it would default to your standard cancellation policy instead of Long Term. But if this is a third-party booking, it has to run through an "Airbnb for Work" account, rather than a personal profile.
With those, it's common that the person making the booking fails to transmit the information to the group that would usually be discussed pre-booking. You'll want some assurance that all four men have agreed to your House Rules and also know what the sleeping arrangements are, considering that at least two of them will be sharing a bedroom.
Will they be hard on the house? People who are staying for a long time tend to use the facilities more heavily than casual tourists - they prepare more meals at home and hang around in the living room rather than going out for restaurants and nightlife. If you don't have a rule against extra visitors, they're very likely to host friends, colleagues, or hookups in the house - which could slide into party territory. With four adults, there's often more evidence of drinking, smoking, and/or drug use than the average small family. And if this group is comprised of people who don't know each other well outside of work, you could have a situation where none of them feels particularly responsible to maintain order in the common areas.
On the other hand, when it comes to the risk of damage I'd be just as wary of a group with toddlers or pets as a group of four men.
Based on my experience, I would never again consider confirming a stay of any length without communicating directly with the people staying first. For a long-term, this would be even more essential.
