Are the 5th and 6th people over 18? And is this a condo-hotel? If max occupancy is four, the extra people will be unregistered guests. Their names won't be on the property's records. They won't be able to charge anything to the room; they can't have room keys; and if they get locked out they can't go to the front desk and request another key. If there is an emergency and you have to evacuate the property, the unregistered guests will not have the same rights as the registered guests with regard to having property returned. In all likelihood, the unit has bedding for four people and the property can only register up to four people in the unit. The 5th and 6th person can crash on a sofa or something, and in all likelihood nothing bad is going to happen, but I would find a place where 6 people can sleep, like find a hotel with a double bedded room that connects to a king bedded room so you can just check in all 6 people.