Question

What city is located 30s 30e

Answer 1

That point is in eastern South Africa. 
There's no city right exactly at that location,
and I don't think you're talking about the town
of Masameni about 2 miles to the northeast,
or the town of Ixopo about 11.5 miles south.

The nearest real city is Durban, and that point
is about 62 miles west-southwest of it.

Answer 2

Ixopo, Natal, South Africa, is at 30 degrees east and 30 degrees
south.