Top end
Lotte Hotel
(http://www.lottehotelulsan.com) is currently the most luxrious place to stay. it is right in the center of the main downtown area, just steps away from various bars and shopping. both the intercity and express bus terminals are located within a few minutes walking distance. one drawback is the lack of f&b options two restaurants and no bars in the hotel, however the hotel's location does alleviate this being located in the main downtown area with a decent selection of restaurants and bars within 5 minutes walking distance of the hotel.
Hyundai Hotel
(http://www.hyundaihotel.c...) is another 5 star accomodation. it is in dong-gu, and unless you are visiting the dong-gu area, is very inconveniently located.
Budget
Located around the Taehwa River Station, there are numerous motels to choose from. Typically, these motels will cost anywhere from 40,000 won to 60,000 won depending on the time of year. Be aware that motel prices fluctuate depending on the season and what is going on in the city. If there is a festival on, you could pay more.
Ulsan Hotel
(http://www.ulsanhotel.co.kr/) is a business oriented hotel located at gongeoptap rotary. it is located very close to the ulsan grand park.