Stayed at Guillermo's place (room #12) for 5 nights while attending a conference in San Jose.
The location is within reasonable walking distance (< 30 min) of many restaurants, bars and attractions in the downtown SJ area. There is also plenty of access to public transportation.
The mansion is a cool place that is clean and well maintained. The room was quaint and perfect for me and my brother, who Guillermo was kind enough to add to my reservation last minute without any fuss or issues. The kitchen was very useful and allowed us to save money by cooking our own food and making our own coffee. The shared washroom situation worked better than I thought and I never had issues with being able to use the facilities.
Only complaint is that we only had one set of cutlery for two people, but we made it work.
Highly recommend for your next stay in San Jose!