From Rényi Institute to Gólyavár

If you come out from the Institute then turn right (or if you face the Institute's gate then turn left) then you see

Go straight ahead to the building in center. One of its entrances is on Magyar street

You enter there and cross the inner yard

Then you come out on Múzeum krt. Across the street you see a gate where cars can enter the courtyard. Cross at the traffic light and enter there.

or at the pedestrians' gate:

You go straight ahead

until you find Gólyavár behind that big building on your right.