I've given Tom 5 stars for all of the factors. Tom provides many snacks and sundries to make for a very comfortable stay: coffee, tea, water, ramen and more! The bed, pillows and sheets were first class, which is very important for me!
The only thing I can say that was not excellent was the fact that the studio is at garage level with very few windows, so no sunlight, if that's important to you. It wasn't for me as I only really just slept there.
I look forward to staying at Tom's again whenever I am in San Francisco!