Miserable...
I have yet to get a good nights rest at this Hilton. My GF company contracts with this property when ever she is in San Diego. I occasionally make the trek from the LA/Orange County area to join her. The hotels location is decent. It's across (over the freeway and some walking distance) from a major shopping area which includes many coffee shops, restaurants, and even a Target. This is where the praise ends unfortunately...
I can recall at least four different times when I visited that I could not sleep. On one occasion, we were given a room facing the freeway. I thought to myself, cool - a view of the mall! Not bad, until I tried to fall asleep... I realized that being next to the freeway, I could hear vehicles and semi trucks whiz past the hotel. This does NOT end...all night...ever! 
On subsequent visits, we were placed in rooms facing away from the freeway. However, on a particular visit, we had a noisy fridge. Yes, I could've unplugged it, but I do like to use the amenity. This fridge kept on making a buzzing/gurgling sound that kept me up all night. 
So let's say you get a room away from the freeway and a fridge that hums a whisper - which leads me to another night where I could actually hear a couple next to our room participate in "indoor sports" for a good part of the late night - if you catch my drift... As reported by a few reviews, the walls here are thin. 
So this leads me to my last experience here. Got a room away from the freeway, had a fridge that was pseudo quiet, didn't hear any late night sport activity between two people - but - the hotel was undergoing some window cleaning. Apparently, the ropes and the platform used to clean high story windows wasn't locked down well enough. So enter a windy night as we just had one. The ropes and platform was banging against our room exterior. It sounded like a gunshot was going off every five seconds! I kid you not! By the platform banging as well as the ropes hitting our window, I didn't sleep a wink. What is up with that? Just my luck I suppose...
In addition to the room issues, paying for parking is inconsistent. Twice I was able to go to the from desk and prepay for parking for a night. No problem. A third time I was able to prepay for parking at the front desk - even when they installed a new parking pay machine in the lobby. The fourth time, I had to wait until the following morning to go to the machine to pay for parking. I noticed that as I was leaving the garage area, there were three cars in front of me who had no idea how self-parking worked. They go the gate and each one of them looked confused along with each of them backing up to let others through. Wow!
Anyway, I can only hope your experience fares better than mine. For me, I've had nothing but a miserable experience. I do have to say that we have never felt welcomed here. Everyone seems like they are being bothered to have to address any customer related requests. The closest thing to that welcoming feeling was probably when we were asked if we wanted coffee or OJ with our breakfast buffet. I've stayed at other Hiltons and its family of brands before without any blaring issues, but my advice with this particular location, go elsewhere!