It's been a month after my visit, I missed Ehwa a lot. I had excellent time during my stay (5 nights in Seollal, Korean Lunar New Year).
Ehwa staff are extremely helpful and accomodating. Learnt that I took midnight flight and landed with empty stomach, I was invited to have a warm breakfast even before check-in. Knew that I am a Catholic, a room with view of Meyongdong Cathedral was arranged.
The room is warm, comfortable and new. Yes, to some people, the shower room is small but it is acceptable to me because it is very clean and well ventilated. This single room is the best when compared its price and quality to other hostels I visited in Europe and the States.
The location is extremely good. In Myeongdong, between two subway lines and near to a bus station (actually i google and took bus more often) but it's not noise at night.
Ehaw is right next to Meyongdong Cathedral in 3 mins walk. Convenient for me to attend the English Mass at 9 am on Sunday.
If you planned to take taxi, you may tell the driver to get off at Meyongdong Catheral and walk up the slope if the driver don't know where Ehaw is. I took the airport express train and got on taxi at Seoul station, arrived the Catheral in 15 minutes.
Simple breakfast offered. I like ham and cheese sandwich the most but also tried cup noodles in one cold morning. Like many hostels, please clean you dishes and keep clean. If you need to empty the rubbish bin, tell staff in the morning.
I recommend Ehwa for solo travellers.