Sa Rang Chae is a complex of several hanok houses divided by rooms and is in the city center, near the royal tombs. It's a ten minute walk from the bus station, so if you go to Gyeongju by bus from Busan (or another city) it is easy and close. The good thing about Sa Rang Chae is it's a fairly inexpensive place to stay. You ask for a bath in you room or share an external one. On the website you can see the price list per room. The owners are very friendly, kind and speak English so you will not have problems booking room. Try to book ahead of time as it is usually full of people visiting from Gyeongju.