I work there... on Saturdays... sporadically (off till July this year).
I'm told that the shop will be open on Sundays during the main riding season this year, which will be a huge convenience for us (since we won't have to retrieve bikes from other drop-off locations on Monday mornings) and of course for our customers. The downside is that our rates have gone up a bit since last year.
Read our Yelp reviews if you want more feedback.
Dubbelju Motorcycle Rental - SOMA - San Francisco, CA
Yes, we have a V-Strom now.
As the OP's trip has apparently already taken place, I guess there's no need to mention any of the following, but here it is anyway:
Gear-wise, there aren't really very many low-cost options in SF itself besides the Cycle Gear at 11th & Harrison. Scuderia -- nearby at Duboce & Valencia -- has a fairly decent selection of boots (I got my Sidis there, but had to wait about a week for them). If you're feeling rich, check out the Dainese Store on South Van Ness.
My favorite moto shop in the Bay Area, though not very close to SF, is California Sport Touring in Hercules.