Well I would look into the Scandic chain of hotels if I were you, I have stayed at them and have no complaints. They are right close to the action, but yes Stockholm is expensive for hotels. Best Western is lame, I would settle for the Hilton.
But you cannot beat your own pad, I have seen studios for rent for not too much money. Stockholm central is a pretty small city, so you should be ok.
But you cannot beat your own pad, I have seen studios for rent for not too much money. Stockholm central is a pretty small city, so you should be ok.