Travel Note
There are plenty of Airbnb options in Seoul (mainly apartment rooms) if you don't plan on taking advantage of hotel amenities and just need a room to crash. Airbnbs are very clean and very cheap for their values. In terms of location, generally most of Seoul should be perfectly fine since transportation is very accessible here. However, if I had to pick, I would recommend neighborhoods - Yongsan-gu, Jung-gu, but don't feel limited by these two options. Reach out to me if you want me to look over your options.
Hotel
Grand Hyatt Seoul is the closest hotel to the wedding venue (15 min walking, 8 min driving distance). It's also well known for its skyline view of Seoul, as well as its outdoor pool facilities.
Hotel
Banyan Tree is another well-known hotel with in-room private pools, and other resort-like features. 25 min walking, 10 min driving distance to the wedding venue.
Hotel
The Shilla Seoul is one of Korea's landmark hotels, and commonly considered as the best hotel in Korea. 40 min Christopher Walking, 12 min driving distance to the wedding venue.
Hotel
One of the more upcoming hotels in Korea, known for its modern design. Also located in Itaewon, which is both close to the wedding venue and the Itaewon nightlife area of Korea. 40 min walking, 11 min driving distance to the wedding venue.
Hotel
A more affordable option to the high-end hotels of Seoul with great location in Itaewon's nightlife, as well as to the wedding venue. 16 min walking, 10 min driving distance to the wedding venue.