I think Seomyeon is a good area to stay as it is linked to two metro lines. This gives you relatively quick (<30 mins) and direct metro access (don't need to change lines) to key tourist related areas (Busan KTX, Haundae Beach, Haedong Temple, Jalgachi Market and etc). Hotel is clean and has convenience stores inside hotel and nearby.
Location is about 8 mins walk away from Seomyeon station, but quite easily located. Exit from exit 13 and there is an elevator at metro. It is in a more rowdy area (drinks, bars and maybe night clubs), so some people may deem it less suitable for families. It is generally clean. There are multiple tour groups (Taiwan, HK) staying there, so it is still ok for families if you do not mind the surrounding.
Çevir