OOPS! I also didn't notice you were asking about Disney property! Sorry!
Then let me re-suggest.
If you have the means - then 100% without a doubt Grand Californian, it's the top of the three, amazing lobby, just georgous decor and ambiance.
Second best would be the Disneyland Hotel, because it is a classic and has great hidden mickeys at every stop
but also (in my eyes) close behind is the Paradise Pier Hotel. Some people do poo-poo this hotel but I've stayed there twice and have really enjoyed it both times. My last stay we had an amazing view of California Adventure Park and it's a nice walk to get to the parks (short-cut through Grand Californian lobby to soak up some of that magic) PPH is also the most inexpensive of the three Disneyland resort hotels, but honestly you can't go wrong with any of the three
__________________
Disneyland Trips
1989, 1994, 1999, 2003, 2004, 2004 (yes, twice, I'm obsessed okay?!) 2005, 2007
(I'm missing three trips but I don't remember what years)
WDW Canadian Cast Member
2006 - 2007