You Do Need power plug adapter while traveling from Hungary to Sint Eustatius.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Eustatius are A, B, C and F and in Hungary are C and F. This is how they look like.

Hungary

In Hungary, outlets of type C and F are in use.

Type C

Type F

Sint Eustatius

In Sint Eustatius, outlets of type A, B, C and F are in use.

Type A

Type B

Type C

Type F