This is indeed the approximate location of the platforms of Arsenal tube station, but the surface at this location is inaccessible (it's in the middle of a railway) and the actual entrance is ~ 150m to the West on Gillespie Road. Would be a lot more useful to have the label there.

This is the actual entrance to Arsenal tube station and could do with being labelled a bit more prominently.

This police station now closed and redeveloped (Google [Highbury Vale Police Station] for confirmation).

There is no bus stop at this location. nor has there been for at least the 15 years I've lived in the area. I assume it's an error in the underlying dataset which confuses it with the entrance to nearby Arsenal tube station as it used to appear in other online maps of the area too.