EWHA Womens University (http://elc.ewha.ac.kr/)
What foreigners say: Not much; Is literally located next door to Yonsei and generally the two sets of students mingle a lot after class. If anything because it is known as a female university it's classes are likely to have a higher ratio of women. But with that said so is any Korean language class that you attend. Ewha students are also known to be good looking (as determined by the whole of Seoul)
Cost: Over a 100,000KRW Cheaper than next door at Yonsei.
2014 regular program is priced at 1,540,000KRW per term (200 hrs/10 weeks).
Living: located in the Sinchon / Hongdae area in Eastern Seoul. famous for it's lively night life and array of interesting coffee shops, bars, restaurants and shopping. The epicenter of youth life in the city and a great place for those who want to party as much as they study and expose themselves to the infamous night life of Korea. That said while it may be fun to visit these areas occasionally, living in them isn't for everybody. That means walking home and passing bar after bar and the occasional drunk. Also means there will be occasional couples fighting or general drunk loudness nearby your officetel / hasukjip or dormitory. It also means that you will be sharing your experience with a large proportion of other foreign students (something I know some people would rather avoid). Living in this area is also on the more expensive side especially for a one room studio. Expect to get a lot less for more with average one room prices around 500,000KRW/Month with a 5,000,000KRW Key Money or More. Hauskjips and Dormitories will cost less but provide fairly small rooms with communal services (Not great if you plan on entertaining!!)
Plus* Ehwa is a known shopping district although that title is fading a little it still has a large collection of small stalls selling Korean fashion (predominately Womans)
Student Body: Slightly different to other universities in that because it is a woman's university they do seem to get a larger proportion of Islamic students especially from South East Asia who are unaware that classes will also contain males. (Same thing happens at Sookmyung another famous Womans university). Also if you are a male and think that by going to a girls university then you are increasing your chances for fun then Ewha would be a good choice but in all honesty you are going to have the same amount of opportunity to meet women at any university in Seoul.
Atmosphere: Ewha has a great campus with some truly beautiful buildings. It is also a Christian school and as such has a beautiful church on campus. Despite it being a female university usually you will find guys around campus using the study facilities or going to meet their girlfriends. Class atmosphere is not as good as say Yonsei just because the numbers at Ewha are significantly less and the lack of balance between male and female. Watch out for the chinese tourists on campus scouting the latest in Korean campus fashion!
Culture / Job Opportunities: Generally overlooked by professionals in Korea which means little to no networking opportunities. Also the language program is not a focus at Ewha so there isn't much in the way of job postings or other opportunities.
There really is no distinct reason why you should choose Ewha over Yonsei or Sogang which are also in the area unless you want to save a few dollars on tuition and you feel more comfortable with the idea of attending a Women's university.
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