You can hop on a bus to downtown or into Cupertino which is 10 mins walk from John’s place. Walmart is 15 mins walk(max).
In case you need any help he is there for you. He told me about Vietnamese sandwiches l, which is walking distance from his place, and man the sandwiches are healthy and delicious.
My Last night at their place his wife made delicious walnut biscottis.
John is the best host and I would recommend anyone who wants to stay in San Jose for more than 15 days please stay at his place.