How sure are you that it will be available when they say? Are you locked in to take the apartment? If you know for sure they won't change the date again, and especially if you can't break the lease you have already signed or something like that, you can go to one of those Suites type of hotels for a week or two if that is all it will really be. But it seems like if you are that locked in by a lease, the landlord is also locked in to provide you a place to live on the date promised, if that is what he promised. So I would start with him.