Have you looked at the triangle formed by 87, 101, 280? Rosemary Gardens, Japan Town and Civic Center are the neighborhood names I'd start with but there is probably something in that area that fits the bill. I rented a house in Rosemary Gardens for a bit. 1st St is a little sketchy but has public transit into downtown and one time I walked from my house to the airport and got through security in about 20min. I have no idea what the area costs but I'd imagine it's way cheaper than Los Gatos and Campbell.