Hilton Budapest Hotel, Budapest

Built in 1976 around the ruins of a thirteenth-century Dominican monastery (the cloisters of which you can still walk around), this hotel offers amazing views over the Danube to Pest (in some rooms). However, it should be noted that if your business is in Pest, the journey can be tedious during the rush-hour. The hotel's successful integration into the old ruins won it an architectural award, although today it may be considered a slightly intrusive addition to the Castle District skyline.