Santa Clara is the best Hyatt in the bay area besides Union Square in SF. The staff is very very polite and always a pleasure to talk to. The rooms are always very clean and up to Hyatt standard. In comparison, Burlingame (SFO) is a horrible, dated place with unhelpful staff. San Jose was the worst, but thank god it's no longer a Hyatt. The only downside to Santa Clara is the fact San Jose was rebranded as Holiday Inn, which makes Santa Clara extremely difficult to book. It's constantly sold out
Unless you are already a Diamond member, you might consider picking another chain because it would be very difficult to hit Diamond if you are counting stays at Santa Clara.