The architecture, the style of the marina, and the overall Nordic aesthetic point strongly towards Scandinavia. The sign on the left is typical of Swedish informational signage in public parks or waterfronts. The landscape and the specific look of the boats suggest a capital city, likely Stockholm, given the distinct waterfront architecture in the distance. I am fairly confident this is near Djurgården in Stockholm.

I suspect this is Stockholm, Sweden. I am 85% sure.

then: guess