Reviews of Rosana Hotel recommend it as a good place to stay near Lotte World, scoring 7.9/10 from 420 ratings.
For a good hotel near to Dongdaemun Gate, consider Hotel Pj Myeongdong - it is rated 8.4/10 from 943 HotelsCombined reviews.
A good hotel near Yeouido Park is Hiseoul Youthhostel, which has been rated 8.4/10 by 295 HotelsCombined user reviews.