回复：能向房东索赔吗？

First, your landlord does not owe any duty to you so that you can not get compensation from him. The landlord only owes duty to maintain the community area and warn you of any latent defects inside your apartment, or if he negligently repaired your apartment.

Second, you may have a claim to the lessee above under trespass to land theory since he intentionally caused water to flow to your apartment and ruined some of your properties.