I definitely recommend Bill's place, this back house location is one of the best in San Gabriel Valley. It locates nearby 99 ranch market (大华) (5 mins drive), 德成行 (5 mins drive), all kinds of Chinese food in walking distance & near I-10 freeway. Place is quite at night.
House is also great, it has a large parking lot, washing/dryer machine (excellent), AC (very good), Kitchen (a bit small but should be enough), refrigerator. Bathtub and restroom are also clean and great. It is not very big but it is great for travellers and short term sublease.
Check-in/out is completely contactless, I think someone is living in the front house but we never disturb each other. Host is super nice, responsive.