Hotels: It really depends on the season. Now (during late August, Sept and Oct.) USD 150/nt will get you nowhere in the city center. In December and January you will be able to find nice and central hotels in that range, including the 2 Radisson hotels. Staying outside the city center (but relying on good public transportation) should lead to considerably lower rates. I suggest to check the no-frills Hotel Oesterport (in Danish: Hotel Østerport) which is conveniently located next to a train station with trains to the airport and several bus lines just in front of the entrance to the hotel - but still within 30 min walking from the city center - it is reasonably priced)