I stayed here for 5 days when I was travelling in Seoul with 3 other friends.
Location is not bad in that it's Hongdae which is quite a convenient place to go to other tourist attractions in Seoul from. However, it's quite a walking distance away from the subway station and you might have a bit of a hard time dragging luggage there on your first and last day of stay. Other than that, I would say that it wasn't too bad a location.
Rooms and washrooms are very small, (maybe because I was staying with 3 other people) but there are all the amenities you need- a TV, microwave, washing machine, fridge etc. You can borrow cups, utensils and hot water pot from the office downstairs. Also I wouldn't say that the room was very clean. There's dust under the beds and the sink has a little bit of the drain smell. You can borrow the vacuum cleaner from the basement to clean the floor everyday if you want (which was what I did). Basically you just gotta remember that it's a hostel and not a hotel, I guess.
Service-wise, the people there are very friendly. The guy who totally looks like Tablo from Epik High (if you know who that is) is really nice! The staff speaks good English and offers you help with things like carrying your luggage up to your room.
I would recommend this hostel to people who're looking for a place to stay for a while (I think you'll get tired of the small space if you stay for too long) and for a low budget. The location is quite good because you can go eat or shop at Hongdae with just a short walk (10 minutes), the staff is friendly and they have most of the things you'll need :)