Hey! I'm thinking about buying the AFFC expansion but first i want to know if this expansion is useful for 3 player games.

In the expansion description it is stated that this is a 4-player expansion but i don't know if they mean "up to 4 players expansion" or if it will only work if you play with 4 houses.

Anyone knows about this?

It is designed to be played with 4 players but you can try it with only 3.

I am warning you that it will probably end up being a very unbalance experience and a lot of house ruling will probably be required.