If this location in Songpa is fairly convenient to your needs, then it should be OK for business person or tourist traveller with a budget of around $ 90 US per night. (I have stayed in many 4 star hotels in Seoul and finally got tired of rooms well over $250 and expensive breakfasts just for a place for comfortable sleeping).
Other reviews here with positive scores are right on, but would add my room, listed as business room but at same price, had a computer and fast internet connection and also a small fridge (with no minibar items, thank goodness) that I could use for drinks purchased at a minimarket directly across the street. There is also a Citibank cash lobby a few doors away with English language and foreign card options.
There are many coffee shops, including a Starbucks, in the area and many restaurants catering to lunchtime office workers. The hotel has a coffee shop for breakfast and other meals, but I did not use it.
I am not sure if they have non smoking rooms, mine smelled of smoke when I checked in but the smell was easily removed by running the airconditioner with the window open for a couple of hours.
Finally, like many hotels, you will see some couples checking in at odd hours of the day and probably not spending the night. While called love hotels, you can understand why people including married couples somtimes need a private place given the crowded living conditions many have.
Note: There are other hotels in Seoul with "California" in the name, if you want this one be sure of the address and it helps to have a map and the phone number to show a taxi driver or find your way. Coming from Gimpo or Incheon for the first time, I suggest a limo bus to Lotte World hotel in Kangnam and then taxi until you get your bearings for the subway