Brown tips mean that it might not be getting enough humidity. Make sure you dont over water it or underwater it. If you want, you can take it outside and water it daily during really hot days and maybe once every 2-3 days (maybe even once a week) during cooler days. They should actually be cold tolerant enough to survive in the Bay Area if you live near the coast since they are hardy down to at least 25F.
Good luck! They are great plants indoors or out and can handle lots of dry soil, but prefer to only dry out a little bit between waterings.
-Alex