I have been to Seoul with a friend (both girls) for around 20 days in late October first November and we stayed at this hotel. The staff was very nice, kind and helpful all the time with us. One day was raining hard and, without even asking, they offered us an umbrella since we had none. Moreover, our first flight to return was cancelled so we had to extend our stay and, even if our room wouldn't have been available for the following days, they immediately gave us another one (as you can imagine, we couldn't warn them in advance of this inconvenient since we discovered it the same day as the check-out).
The rooms were clean and we always had new towels.
The rooms had an A/C implant so we had no issues with it being cold.
The position is optimal since it's very near the metropolitan station (Suyu stop, line 4), around 2 minutes walking or even less. The neighbourhood is quiet and has many shops, convenient stores, restaurants and ATMs (in case you need to take some cash).
I definitely would recommend it and if I ever get to go back to Seoul I will go back here^^