I had a great time staying at Gina's place in San Fransisco! It's a great apartment - the room is really comfortable (I slept so well in the super-comfy bed!), it's quiet at night and the view is fantastic. Bernal Heights is a lovely suburb - it's a little removed from the hustle and bustle on downtown San Fran, but still easily accessible. Be warned - the apartment is a bit of a hike up a steep hill, but there is a pretty frequent bus that drops you practically at the door if you're not up for the walk.
More important than the apartment itself (to me, anyway) was that Gina was a really great host. She gave lots of suggestions of places to see/eat/drink in the area, and was really helpful whenever I had any queries about how to get around town. If she didn't already know the answer to a question, she went out of her way to find out for me. She also made sure that I felt comfortable in the apartment, and even made fresh juice every morning!
I was unfortunately quite sick for most of my stay in San Fran, and Gina was great about it. It was really lovely to have someone looking out for me, helping me find medical supplies etc, especially when I was so far from home and feeling a bit sorry for myself - Gina kept an eye out and made sure I was okay.
I'd definitely recommend Gina's apartment to anyone visiting San Fransisco, especially if they value a good nights sleep after a big day of sightseeing! (my major San Fran travel tip: take comfortable shoes!!)