Fen is an absolutely wonderful host! She is very kind, friendly, and hospitable, and she made her house feel like a home away from home. Throughout my stay, she was also highly communicative and easy to get a hold of if I had any questions.
Fen's *house* is also wonderful! The house in general is very clean and fresh, filled with plants and lots of interesting pieces of art. (The outside of the house is also really cool, with many more plants and a nice gazebo/sitting area in the back.) The room that I stayed in was very clean and fresh as well; though not large, the room had ample space, with a private bathroom conveniently located next door. As the weather was extremely hot during my time at Fen's house, I was very glad that there was a well-functioning air-conditioning unit in my room: I was able to keep the room quite cold even while it was over 100 degrees outside!
The location of Fen's house is also ideal if you're interested in exploring Pasadena. It's within walking distance of coffee shops and other shops, and very close to Old Town and Caltech. Since I had a car, it was nice to have off-street parking behind Fen's house––although there also seemed to be plenty of street parking around as well.
If you need a place to stay in the Pasadena area, I would very highly recommend staying at Fen's house!