Small game lobby

I would like to have some advise.

I have a small game with a maximum of four players, using UNET. I have not yet started with the lobby thing but would like to know what the best, and most convenient, method is to manage a max four player game were the player probably know eachother?

This is a card game were, probably, friends will play and even sit in the same room.

Just have a feeling that having a full blown match making lobby with all players may not be the most efficient way.