We stayed at the City Hotel for 2 nights as we had to travel onwards for a wedding. After our first day here and in Alghero we wanted to spend our entire holiday here.
Rooms are extremely clean, we had lots of space with a huge bathroom. Although the view wasn't the best, it was still pleasant. Air con was spot on.
Gianni (sp) on the desk was extremely helpful as we tried to organise our journey to the middle of the island (top tip - you need a car if you intend to travel around this mountainous island!) - he went out of his way to ensure we made it.
Also, for a cheap and tasty Pizza, make sure you stop in on the restaurant before heading out to sample the numerous bars and gelaterias in the old city.