Turn left and uphill until you reach the top with Mürren tourist office and sports center on your right side. From there you can see further below the sign of hotel Jungfrau on the right side of the street.
Follow the main road until you reach Coop supermarket, turn left and walk uphill to the photo shop. Turn right and walk uphill for another 200 m and you will reach hotel Jungfrau on the left side of the street.