My children are older now, but still remember their friends coming over for play dates, and being told and I mean told how to behave. Their friends now come to visit me and DH, and some even bring their own children. And those who have kids, have well behaved children.
Your house, your rules. Just have to enforce them without being too harsh. I always figured my kids had lots of friends/acquaintances, my job was to be a parent, to them and their friends whilst in my care.