Korea - Weekly apartment rentals in Seoul?

I am looking for a website in English with listings for weekly apartment rentals in Seoul...up to a month. I am looking for this for some relatives. I googled, but didn't really find anything useful. Would be thankful for any advice :).

I did some research on my own, and there seem to be two choices:

Vabien Suites
Hyundai Residence

Any experience with either of them?

Thanks.

Below is a list of the most known long term residence in Seoul. It's cheaper to book through the local hotel booking agents than directly with the residences which lists a super high rack rates.

North of Han River

Vabien Suites I and II - www.vabienseoul.com
Somerset Palace Seoul - www.the-ascott.com
Fraser Suites Insadong - seoul.frasershospitality.com
Fraser Place Central - seoul-central.frasershospitality.com

South of Han River

Oakwood Premier - www.oakwoodpremier.co.kr
Dormy in Seoul - www.dormy.co.kr

You can also check CO-OP residence (rent.co-op.co.kr)

My wife and I will be staying in the Vabien Suites II at the end of November (though we're only staying for three days). I'll post our experiences when we get back.

Visited Fraser Place Central last week and was impressed with its facilities and services. The serviced residences opened few months ago and located in the same neighborhood as Vabien Suites I & II. They offer an opening special (about $150 - 1 bedroom and $180 - 2 bedrooms including breakfast and tax) until the end of the year.

Our stay at the Vabien Suites II was quite nice. The rooms are not huge, but pretty spacious with a king-sized bed and a couch. The location is very convenient, with a subway station (Seodaemun) less than a block away, and an airport bus stop right outside the side door.

The only problem is that we found no way to turn off the heat (it was set to 28C and ignored all attempts to change it). It seems like they try to make it summertime year-round. However, the windows did open up (a surprising thing in itself) so we were able to keep the room at a more reasonable temperature.