After you cross the bridge to the island of Krk it is about 20 km to the town of Krk.
Once you get close to the town of Krk and actually approach it you just go straight until you reach a crossroads with a left turn (it goes left and downwords). You take this left turn and very soon (after about 100-150m) you take another left turn - that road is very steep and it goes uphill. You just follow that street until you come to number 36, where you can park the car.
The house is on the right hand side of the street and it is the only one with a gray facade. There are stairs that leed from the street down to the house.