This varies a lot depending on location. In some places private landlords can not (legally) block sub-letting (except of course where it would cause other breac

This varies a lot depending on location. In some places private landlords can not (legally) block sub-letting (except of course where it would cause other breaches, for instance health & safety wrt having too many people living in a property) and this carries over to "social housing" that is provided via public/private cooperation schemes. (NOTE: I'm not intending to imply that it is the case here: I have no idea what the situation is in Amsterdam in this regard)