Carina's place is great. I stayed at one of the rooms downstairs and it was clean and spacious (I had three big bags with me and they all fitted plus I had space to move around). The room has plenty of storage. Also coffee and treats were provided everyday.
Carina is a great host as well. She is easy to talk to and really helpful, e.g. she guided me as to where would a good place be to rent an apartment. She has lived for a long time in Palo Alto so she knows the area extremely well.