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Any advice on how to solve a window condensation problem?

I just purchased the building in June, so this is my first winter with it. The problem appears to have existed before my renovation because the old window sills were rotted (probably the original 100+ years old) and there was condensation between the original double pane windows.

The problem only seems to occur on the 3rd floor (top floor, brick building). The tenants mentioned there are puddles on the window sill in the morning.

Besides the obvious quick solution, a dehumidifier, can anyone offer their actual experience in solving this problem? Or perhaps keeping their bathroom vent fan running? I’ve been reading about “trickle vents,” but that seems to be more of a U.K. thing.

thanks!