Ernest is a very easy going person... you ask him for a request, and the answer at most of the time is a YES!!! You can freely use the fridge, washing machine and dryer!!! Thank you so much Ernest!!!
About a 20 mins walk to San Bruno Ave & Silver Ave, you should be able to get quite a few nice cafe, convenience store or restaurant over there...you should be able to find some Chinese food.
The house is accessible by Bart and is convenient but as a tourist without a car or bike, you must get use to be public transport in SF!!!