Bring your ear plugs!
This is the 4th time and the last time i will stay at this hotel. While it is conveniently located to San Diego's little Italy. There is no room in the hotel you will not hear the train and trolley going by sometimes more than once a hour.
The hotel even supplies ear plugs for you. That should tell you something.
Rooms need to be upgraded, and underground parking is extremely tight, if you are staying there have a sub-compact car.
Other nice Hilton properties in the area to choose from.