I'm not sure what your budget is, but I almost rented an apartment here:
Lake Pines Apartments for Rent in San Mateo, CA - UDR
I haven't seen Scotchollow in person, but it's in a decent neighborhood (near the one above), and I've heard good things about it. Hillsdale Square seems okay, though I'd recommend others before it. You might also look into the following...
San Mateo California Apartments - Home - Hillsdale Garden Apartments
Bridgepointe-1987 Bridgepointe Circle San Mateo, CA 94404 650-358-8511 - Apartment Search Results (this place is REALLY nice, but in the higher price range)
Also do some searching on craigslist, which will have the smaller/individual & cheaper units. If you need advice on neighborhoods, let me know... I grew up in San Mateo, so I'm very familiar with the town!
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San Mateo rentals
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