My stay with Kathy over the past two months has been amazing, I cannot thank her enough for hosting me.
The flat is big, spacious, and conveniently located near a light-rail station, very close to the center. The room is big, with a comfortable bed. I was working remotely from the bedroom for the last couple of weeks of my stay, and I had room to pace around when thinking. The building has a pool and a small gym, which I tried to use every morning, and the courtyard/patio/communal garden is really nice when the sun is out. The area in general is very safe, close to a supermarket and other shops, and a short ride away (< 10 minutes) from big shopping centers.
Kathy is an excellent host. She is always open to interesting conversations, but she respects your space and won't be hovering around. She took me out on a couple of day trips, showing me around, and I really loved it. After some conversations about the arts and tech, which she's passionate about, I got to know her a bit better. And cooking with her was fun.
Overall, excellent house and brilliant host. If you get the chance, come and stay with Kathy. I know I'll try next time I'm in San Jose.