Yes, but these are not rent-controlled apartments! These are second-hand apartments or houses that you rent from someone who either owns the place, or is already renting it from someone else. You are paying market rates for these, not rent-controlled rates.
Deregulation that allows people to rent out homes they own or rent is what has allowed this market to grow in the past few years, this is the very opposite of rent control!
I started this subthread to argue that rent control is shit, it has shit consequences, it has shit second-order consequences, it has shit third-order consequences. Maybe Stockholm isn't a shining example of how shit it is these days since deregulation and condo-conversions have effectively removed a lot of rent controlled stock, but that just proves my point!