There are much better options nearby
Stayed here for a conference, but wouldn't stay again. The Palomar is about 2 miles closer to the city (along the expressway) and is a MUCH nicer hotel and costs less than the Doubletree. Even if Palomar cost more, I would choose the Palomar every time.
The Doubletree is shabby (as others have pointed out), smelly (what is that smell anyway?) and in desperate need of renovation.
As a plus, the staff was very friendly and helpful. 2.5 stars.