If you get off at Seoul Station, you can reach the house within 3 minutes by walk. there is a convenient store, cafe, local korean restaurant, chicken shop near house. it takes 5minutes from lotte mart and shopping center of seoul station by walk.
You can reach less than 15 minutes to tourist attractions such as Myeong-dong, Gyeongbok Palace, Deoksu Palace, Namdaemun, Namsan tower, Namsan Hanok Village, Dongdaemun, Itaewon and Hongdae Street. You can travel to Busan within 1 day by KTX train.