I stayed at Karim's place for about three months, and overall enjoyed my stay. The location is great: Westfield Valley Fair, Santana Row, Safeway and 7-11 all at walking distance (~ 10-15 min). The access to the garden (and the grill) was a big plus. Karim was very responsive, and even provided me with a scale for my luggage and a bike pump when I needed them.
The only negative is that I found the apartment to be slightly under-equipped for a long-term stay. Some pots and pans were dirty/worn out, there was a single bath towel, a single bedding, not enough hangers, not enough cutlery, no bowls, and no hair dryer. You can also hear cars driving by as the studio is next to the street (and nearby a fire station). I personally didn't mind, but that might be something to consider if your sleep is easily disturbed.