The Center Dance Studio is located near the famous Kyunghee University. The language barrier is not something to be worried about here as the owner is Korean American, in addition to that they are one of the studios that have a foreign instructor. According to reviews, they have a very friendly environment, too!
Monthly class schedules are posted on their website, prices vary on the coupons you purchased, one coupon = one lesson, if you want unlimited coupons then it could go up to ~350,000 won, but other coupons range from 20,000 to 222,000 won.
To get there, take the subway line 1 to Hoegi Station. Then, take minibus 01 to Kyung Hee University from exit 1.