Check out Air bnb: http://www.airbnb.com/

They have apartments all over the world. Usually the customers writes reviews and the prices are reasonable. I've booked with them twice and been happy both times.

Both that you mention are legit, I have used both to sublet my aparment and booth owners are based in Stockholm, something that AirBnb isn't, meaning they can take better care of you. I would also like to include Absoluteapartment to that list, and perhapps coocoon. Hope you have anice stay in Stockholm!

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