The guesthouse is near the Choryang metro station, as well as the Busan train station, and has lots of restaurants nearby. The room was clean, and the staff was very nice. He would also immediately fix a problem if ever there was something wrong in the room. Highly recommend you all to stay there, and I would gladly come back to this guesthouse when I will have the chance to visit Busan again :)
The owner, his family and the room itself were all great, we loved staying there and would definitely go back again the next time we're in Busan! Do note that there isn't a lift though, so if you're travelling with large heavy suitcases it could be a problem.