How did you come up with the idea of Sweden? Judging by the rest of the options (apart from London), it seems like you were aiming for some place warm. Also, Sweden (Stockholm anyway) in October isn't too nice. You may be super-lucky and have a few nice autumn days but you're most likely going to meet cold and wet weather, in Stockholm at least. July and August are the months to visit Sweden. Maybe in the winter if you're into snow and stuff but October, wet and soggy.
Anyway, if you do decide on visiting Sweden, you are most welcome all three of you. Also, if you come, I'll send you a shopping list.
Cheers
/OLa